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Chapter 15: Creative AI with Nano Banana

Image Generation for Ideation — What It Can Do, What It Cannot, and Why the Boundary Matters

1Chapter 15: Creative AI with Nano Banana

Illustrated explainer infographic showing the Nano Banana creative workflow for GES — from text prompt to generated concept image, with labeled examples of booth concept exploration, mood board direction, and pitch visual generation, positioned firmly in the ideation phase before human designers take over for production

Figure 1:Nano Banana gives GES creatives a new tool for the earliest phase of design work — the “what if” exploration that happens before anyone commits to a direction. The output is never the deliverable. The output is how you find the deliverable faster.

“The best way to have a good idea is to have lots of ideas.” — Linus Pauling

Here is a scene that plays out somewhere in GES every week.

A Spiro creative director is preparing for a pitch meeting in 48 hours. The client is a pharmaceutical company launching a new therapy at a major medical conference. They want an immersive booth experience that conveys “breakthrough innovation” without the cold clinical sterility that pharmaceutical booths often default to. The client has sent a brief with words like “warmth,” “human connection,” and “scientific precision” — concepts that mean different things to different people.

The creative director has three directions in mind. In the old workflow, she would sketch rough concepts, describe them in a deck, and hope the client can visualize what she means. In the new workflow, she opens Google AI Studio and types:

“A pharmaceutical trade show booth, 40 by 40 feet, with warm wood accents and soft ambient lighting. The central feature is a curved LED wall showing abstract cellular imagery in soft blues and greens. Attendees are gathered in small consultation pods with fabric dividers. The overall feeling is welcoming and human, not sterile. No visible text, logos, or branding.”

Ninety seconds later, she has a visual. Not a finished design — she would never present this to a client as finished work — but a direction. A starting point for conversation. Something that answers “do you mean this, or something else?” before the design team commits forty hours to a concept the client did not actually want.

That is what Nano Banana is for. Concept exploration at the speed of conversation. Rapid visual iteration that compresses the early ambiguity phase of creative work. A tool that helps GES creatives arrive at the right direction faster, so they can spend their time on what only human designers can do: the final work that actually ships.

This chapter is for GES creatives — exhibit designers, environmental designers, graphics production teams, and the Spiro creative team. It covers what Nano Banana can do, what it cannot do, where it genuinely helps, and where it must not go. The distinction between ideation tooling and production art is not a footnote. It is the operating principle that makes this tool safe to use.


1.11. What Is Nano Banana? The Three Model Tiers

“Nano Banana” is the internal nickname Google’s developers gave to their image generation models — a playful name that stuck. The models are part of the Gemini family and are accessed through Google AI Studio at aistudio.google.com. You do not need to install anything. You do not need to be a developer. You need a Google account and a browser.

Three-tier comparison diagram showing the Nano Banana model family — Nano Banana (Gemini 2.5 Flash Image) on the left as the fast and economical option, Nano Banana 2 (Gemini 3.1 Flash Image) in the center as the faster successor, and Nano Banana Pro (Gemini 3 Pro Image) on the right as the highest quality option with best text rendering and reasoning

Figure 2:The Nano Banana family has three tiers — each with different tradeoffs between speed, cost, and quality. For GES creative work, the iteration workflow runs wide and cheap on the fast models, then re-renders only winners on Pro.

Nano Banana (Gemini 2.5 Flash Image)

The original. Fast, economical, good for rapid iteration. At approximately $0.039 per generated image, you can explore dozens of directions without thinking about cost. Generation takes seconds, not minutes. This is your workhorse for the “let me try five different approaches” phase.

Strengths: Speed. Cost. Good enough quality for concept exploration. Strong at understanding scene composition and style direction.

Limitations: Text rendering is unreliable. Fine details can be inconsistent. Not suitable for images that will be shown to clients without heavy caveats about what they are seeing.

Nano Banana 2 (Gemini 3.1 Flash Image)

The faster successor. Released as an evolution of the original, with improved speed, better adherence to prompts, and more consistent character and object representation. Still economical, still fast, now with fewer quirks.

Strengths: Better consistency than the original. Improved prompt adherence. Good for iterating when you need more reliability.

Limitations: Still struggles with text rendering on anything beyond simple short labels. Still not production quality.

Nano Banana Pro (Gemini 3 Pro Image)

The flagship. Built on Gemini 3 Pro’s reasoning capabilities, this model produces the highest-quality output with the best text rendering — around 94% accuracy on short text, according to Google’s benchmarks. Supports 4K resolution output. Better at understanding complex scene descriptions with multiple elements.

Strengths: Highest visual quality. Best text rendering (though still not perfect). Strong reasoning about spatial relationships and composition. 4K output for high-resolution needs. Supports up to 14 reference images for character and style consistency.

Limitations: Slower than Flash models. More expensive (though still far cheaper than a photographer or a stock image license). Text rendering, while improved, still fails on long words or unusual terms.

Which tier when?

The iteration workflow that works for GES creative teams: generate wide and cheap on Nano Banana or Nano Banana 2, explore many directions, identify the winners, then re-render only the selected concepts on Pro for higher quality output. Do not start with Pro. Start with volume.


1.22. Where to Find It — Google AI Studio

Screenshot-style diagram of the Google AI Studio interface showing the prompt input area, model selection dropdown, and generated image output panel — with labels pointing to key interface elements for first-time users

Figure 3:Google AI Studio is a browser-based interface — no installation required. Select your model, type your prompt, and generate. The interface is intentionally simple; the complexity is in learning to prompt effectively.

Getting started:

  1. Go to aistudio.google.com

  2. Sign in with a Google account (personal or Google Workspace)

  3. Click “Create new prompt” or use one of the template apps

  4. Select the model from the dropdown (look for “gemini-2.5-flash-image” or “gemini-3-pro-image”)

  5. Type your prompt and click Generate

Google AI Studio includes “Build Mode” templates that let you try specific capabilities — character consistency, image editing, multi-image fusion — without starting from scratch. These are worth exploring when you are learning what the model can do.

What it costs:

As of this writing, Nano Banana (Gemini 2.5 Flash Image) is priced at approximately $0.039 per generated image. Nano Banana Pro is higher but still in the dollars-per-session range, not dollars-per-image-at-scale. Google offers a free tier with rate limits for experimentation.

For GES usage, the cost is negligible compared to the design time saved. A creative director exploring ten booth concepts costs less than a single cup of coffee.


1.33. What It Is For — Ideation, Not Production

This is the most important section in this chapter. Read it carefully.

Two-column comparison diagram showing ideation uses on the left (booth concept exploration, mood boards, pitch visuals, client clarification, texture studies) with green checkmarks, versus production uses on the right (final client deliverables, print-ready graphics, fabrication specs, production art) with red X marks — the division between where Nano Banana helps and where it must not go

Figure 4:The bright line: Nano Banana is for everything to the left of the handoff to production. Human designers own everything to the right. A generated image never goes to a client as finished work or to a printer as production art.

Nano Banana is ideation tooling, not production art.

That sentence is the operating principle. Let me unpack what it means in the GES context.

Ideation is the early, exploratory phase of creative work. It is the “what if we tried this direction?” phase. It is mood boards, concept sketches, look-and-feel exploration, rapid visual brainstorming. The goal of ideation is to find the right direction before committing significant design time. Nano Banana accelerates this phase dramatically.

Production art is the finished work. The graphics that go to the printer. The renderings that go into the client deck. The signage files that go to fabrication. The visual deliverables that carry the GES name. Human designers own production art. Always.

Why the distinction matters:

  1. Quality. Nano Banana output is good enough to explore directions. It is not good enough to represent GES’s standard of work. A generated booth concept has inconsistencies, artifacts, and details that would embarrass us in a final deliverable.

  2. Accuracy. Generated images invent details. They cannot be trusted for dimensions, proportions, or specifications. A generated booth image might show a structure that is physically impossible to build, or a layout that violates fire code. Never use output as a spec, measurement, or build drawing.

  3. Rights and attribution. AI-generated images carry legal ambiguity around copyright. The work that goes to clients must be work GES can warrant and stand behind.

  4. Client expectation. Clients expect GES to deliver professional design work created by professional designers. That expectation is part of why they hire us.

Where Nano Banana genuinely helps:

Booth Concept Exploration
Mood Boards and Look-and-Feel
Pitch and RFP Response Visuals
Signage and Wayfinding Mockups
Environmental Design Comps
Texture and Material Studies
Client Clarification

Before a designer commits forty hours to a rendering, explore the direction with five generated concepts in ten minutes. “Is the client thinking dramatic and dark, or bright and welcoming?” Find out before you build.

The workflow in practice:

  1. Brief arrives or pitch opportunity opens

  2. Creative lead generates 5-10 concept directions in Nano Banana

  3. Team reviews, selects 2-3 directions worth developing

  4. Human designers develop selected directions into production-quality work

  5. Production work goes to client

Step 2 is what Nano Banana is for. Steps 4 and 5 are where human designers do what they do. The tool compresses step 2 from days to minutes. It does not replace steps 4 and 5.


1.44. The Confidentiality Boundary — This Is Not Inside the Trust Perimeter

Diagram showing the confidentiality boundary between Microsoft 365 (inside the trust perimeter, containing SharePoint, Teams, Copilot, and GES client data) and Google AI Studio (outside the trust perimeter, accessed via browser with no enterprise integration) — with a clear barrier between them and warning labels on what must not cross

Figure 5:The trust boundary is architectural, not optional. Google AI Studio operates outside GES’s enterprise security perimeter. Client confidential material stays inside the perimeter. Prompts go out; confidential assets do not.

Why this is more serious at GES than at most companies:

Chapter 12 covered this in detail, but it bears repeating in the creative context.

GES serves direct competitors at the same show. A pharmaceutical company’s booth is thirty feet from its rival’s. Both are GES clients. Both trust GES with unreleased product information before launch. That trust is the foundation of an 87-year relationship with the exhibition industry.

A prompt that includes “here is what Client A is planning” and then gets used to generate concepts that inform work for Client B is a cross-client contamination incident — even if no human intended it. The tool does not know which client is which. You do.

Practical prompting for confidentiality:

Instead of: “Here is a photo of the client’s unreleased product. Generate a booth concept featuring it.”

Do this: “Generate a pharmaceutical trade show booth concept featuring a central product display area with dramatic lighting. The product is a medical device approximately the size of a small refrigerator. The overall feel should be high-tech but approachable.”

The difference: the first prompt leaks client IP. The second prompt describes what you need without exposing anything confidential. The generated image will not be of the actual product — it will be a conceptual placeholder that shows the type of display you are imagining. That is exactly what ideation needs.


1.55. The Real Limitations — What Actually Goes Wrong

Nano Banana is powerful, but it has specific failure modes that every GES creative needs to understand. These are not theoretical concerns — they are observable, repeatable behaviors that will bite you if you do not plan for them.

Grid of six example images showing common Nano Banana text rendering failures — garbled words on signage, invented copyright notices, fabricated company names, nonsense text on document props, unwanted captions, and inconsistent letter spacing — each with a label describing the failure mode

Figure 6:Text rendering is the #1 failure mode. The model attempts to write what it thinks you want — and frequently invents, garbles, or hallucinates text that was never requested.

1.5.1Text Rendering Fails

This is the number one problem. Nano Banana struggles with text, especially:

1.5.2Invented Attribution

This is a real legal exposure. When generating images, Nano Banana sometimes invents:

1.5.3Unwanted Captions and Labels

The model often adds descriptive text nobody asked for:

These additions make the output unusable without editing — and editing AI-generated images is its own skill set.

1.5.4Dimensional Unreliability

Generated images look plausible but are not accurate:

Never use a generated image as a specification. It is a visual direction, not a build drawing.

1.5.5The Prompt Discipline That Fixes This

After extensive use, the following prompt structure produces dramatically cleaner results:

Explicit text control:

End every prompt with explicit instructions about text:

“...the only text visible in the image should be [LIST EXACT LABELS]. Do not include any other text, copyright notices, URLs, logos, watermarks, captions, or readable content on any props, documents, screens, or surfaces.”

Keep text short:

Any text you do want should be 1-3 SHORT common words:

Forbid props that invite text:

If you do not need documents, clipboards, or screens in the image, explicitly exclude them:

“...no visible documents, papers, screens, or readable materials in the scene.”


1.66. Prompt Structure for Visual Work

Prompting for images is different from prompting for text. When you ask a text model for help, you are having a conversation. When you ask an image model for a visual, you are describing a scene.

Annotated prompt example showing the six components of an effective image generation prompt — Subject, Setting, Style, Palette, Composition/Lighting, and Aspect Ratio — each highlighted and labeled with examples relevant to exhibition design

Figure 7:The anatomy of an effective visual prompt: Subject → Setting → Style → Palette → Composition/Lighting → Aspect Ratio. Each element adds control. Missing elements leave the model to guess.

The six components:

Table 1:Visual Prompt Components

Component

What It Controls

Example

Subject

What is the main focus of the image?

“A 30 by 30 trade show booth for a technology company”

Setting

Where is this? What surrounds it?

“On a convention center show floor with high ceilings and other booths visible in background”

Style

What is the visual treatment?

“Photorealistic rendering” or “Architectural sketch style” or “Watercolor concept art”

Palette

What colors dominate?

“Cool blues and whites with warm wood accent tones”

Composition

Where is the camera? What is the lighting?

“Three-quarter view from elevated angle, dramatic spotlighting from above”

Aspect Ratio

What shape is the final image?

“Landscape format” or “16:9 aspect ratio” or “Square format”

Example prompt structure:

“[SUBJECT] A 40 by 40 trade show booth for a healthcare technology company, featuring a central meeting area surrounded by product demonstration stations. [SETTING] On the show floor of a large convention center with high ceilings, other booths visible in soft focus in the background. [STYLE] Photorealistic 3D rendering. [PALETTE] Clean whites and light grays with accents of deep teal and warm copper. [COMPOSITION] Three-quarter elevated view showing the full booth footprint, soft ambient lighting with dramatic accent lights on the product stations. [ASPECT] 16:9 landscape format. [TEXT CONTROL] The only visible text should be ‘WELCOME’ on the main entrance arch. No other text, logos, copyright notices, URLs, or readable content on any surface.”

Common mistakes:


1.77. The Iteration Workflow — Generate Wide, Refine Narrow

Vertical workflow diagram showing the iteration ladder — starting at the bottom with "Generate 10 concepts on Nano Banana (fast, cheap)" rising through "Review with team, select 3 directions" then "Refine selected concepts on Nano Banana 2" then "Final concepts on Nano Banana Pro" and ending at the top with "Human designers take over for production"

Figure 8:The iteration ladder: start wide and cheap, narrow as you climb, hand off to human designers at the top. The tool accelerates exploration. Humans own execution.

Step 1: Generate Wide on Nano Banana

Start with 10-15 concepts on the fast model. Try different directions. Do not self-edit at this stage — the point is volume. A concept that looks strange in your head might look interesting when you see it.

Prompt variations to try:

Cost for 15 generations: roughly $0.60. Time: under 10 minutes.

Step 2: Review and Select

With your team (or alone if you are the creative lead), review the generated concepts. Most will be wrong. Some will be interesting. A few will spark a direction worth pursuing.

Select 2-3 directions to develop further.

Step 3: Refine on Nano Banana 2

For your selected directions, refine the prompts based on what you learned. Be more specific. Add the details that were missing. Generate 3-5 variations of each direction.

Step 4: Final Concepts on Nano Banana Pro

For the 1-2 concepts you want to show to the team or use in a pitch, re-generate on Pro for higher quality output. Use the refined prompts from Step 3.

Step 5: Human Handoff

The winning concept goes to human designers for actual development. The generated image is reference material — visual direction, not production art.

What you have at the end:

What you do not have:

The distinction matters. The iteration workflow produces direction — the answer to “which way should we go?” It does not produce deliverables — the polished work that goes to clients. That gap is filled by human designers, and it is not a small gap. The translation from “AI-generated concept that captures a direction” to “professional rendering that GES stands behind” is where design skill lives.


1.88. Integrating with the GES Creative Workflow

Horizontal workflow diagram showing how Nano Banana integrates with GES creative process — Brief Intake, AI Concept Exploration (10-15 concepts in Nano Banana), Team Review and Direction Selection, Designer Development, Internal Review, Client Presentation, Revision Cycles, Production Art — with the AI phase clearly bounded and labeled as ideation only

Figure 9:Nano Banana slots into the existing GES creative workflow at the concept exploration phase — after brief intake, before design development. It compresses a days-long exploration into a morning’s work.

Where it fits:

Workflow PhaseWho Does ItNano Banana Role
Brief intake and discoveryAccount team, Creative leadNone — understand the ask first
Concept explorationCreative leadPrimary use — generate directions
Direction selectionCreative teamReview generated concepts
Design developmentDesignersReference only — AI concepts as direction
Internal reviewCreative directorNone — reviewing human work
Client presentationAccount team, CreativesNone — presenting human work
Revision cyclesDesignersOptional — quick visual exploration of revisions
Production artGraphics, FabricationNever — production is human work

Communication conventions:

When sharing a generated concept internally:

When using it as reference for designers:


1.99. What Nano Banana Cannot Do — Honest Limits

Venn diagram showing the overlap and boundaries between AI capabilities and human designer capabilities — AI excels at rapid exploration, volume, and consistent style application; humans excel at judgment, accuracy, production quality, and client relationships; the overlap zone shows direction finding and concept refinement

Figure 10:The capabilities Venn diagram: AI tools and human designers have different strengths. Effective creative teams use both — AI for speed and volume in exploration, humans for judgment and quality in execution.

Cannot do:

Can do, with caveats:


1.1010. Try This — A Complete Ideation Session


1.1111. Productive Struggle Problem


1.12Glossary

Nano Banana Internal nickname for Google’s Gemini-based image generation models. The family includes Nano Banana (Gemini 2.5 Flash Image), Nano Banana 2 (Gemini 3.1 Flash Image), and Nano Banana Pro (Gemini 3 Pro Image).

Google AI Studio Browser-based interface for accessing Google’s AI models, including the Nano Banana image generation family. Accessible at aistudio.google.com with a Google account.

Ideation The early, exploratory phase of creative work where multiple directions are explored before committing to development. Nano Banana accelerates ideation; it does not replace production.

Production Art Finished creative work that goes to clients, to print, or to fabrication. Production art is created by human designers. AI-generated images are never production art.

Text Rendering The ability of an image generation model to include readable text in generated images. Nano Banana’s text rendering is unreliable, especially for long words and technical terms.

Prompt The text description given to an image generation model to specify what image should be created. Effective prompts include subject, setting, style, palette, composition, and text control elements.

Character Consistency The ability of an image model to maintain the appearance of a character or object across multiple generated images. Useful for generating consistent booth concepts or design elements.

Multi-Image Fusion The capability to combine elements from multiple input images into a single generated output. Useful for placing objects into scenes or combining visual elements.

Grounding The connection between a generative AI model and the source data it draws upon. In image generation, this relates to how well the model follows prompt instructions rather than inventing details.

Trust Boundary The security perimeter that defines what data an AI tool can access and what confidentiality protections apply. Google AI Studio operates outside the Microsoft 365 trust boundary that protects GES’s Copilot usage.

SynthID Google’s invisible digital watermarking technology applied to AI-generated images, allowing them to be identified as AI-created or edited.



1.13Discussion Questions

  1. The ideation boundary. Where exactly does ideation end and production begin in your team’s workflow? How would you communicate to a new team member that AI-generated images are for exploration, not delivery?

  2. Confidentiality in practice. A colleague is rushing to prepare for a pitch and asks if they can “just upload the client’s preliminary rendering to get better AI concepts.” How do you respond? What is the principle, and how do you make it practical under time pressure?

  3. Quality judgment. You generate a booth concept that looks good, but something feels off. It would take three hours to explain to a designer what you want; the generated image seems close enough. What is the right call? What criteria should guide the decision?

  4. Client communication. A client sees an AI-generated concept you used internally and asks: “Can we just use that? It looks good enough.” How do you explain why the final deliverable will be better — and worth the additional time?

  5. Text failure workarounds. Your booth concept needs to show “REGISTRATION DESK” on a sign, but Nano Banana keeps garbling it. What options do you have? When is it worth fighting the tool, and when is it better to work around it?

  6. Cross-client awareness. You are working on a pitch for Company A. While generating concepts, you accidentally type a prompt that includes details you remember from Company B’s booth last year. You did not upload anything, but you drew on your memory. Is this a problem? Where is the line?


1.14Leader’s Takeaway

Nano Banana gives GES creative teams a powerful new tool for the ideation phase of design work — but only if the boundaries are clear and the discipline is maintained.

What leaders need to ensure:

  1. The ideation/production boundary is understood. Every creative team member needs to understand that AI-generated images are exploration tools, not deliverables. This is a professional standard, not a guideline.

  2. Confidentiality discipline is enforced. Google AI Studio is outside the Microsoft 365 trust boundary. Client IP, unreleased products, and competitor-sensitive designs must never be uploaded. Prompts describe; they do not expose.

  3. Designers are not threatened; they are freed. The value proposition is clear: AI handles rapid exploration so designers can focus on execution. The tool does not replace design skill. It accelerates finding the direction that design skill will develop.

  4. Prompt skills are developed. Effective prompting is a learnable skill. Invest in a few hours of experimentation so your team knows what works and what fails.

  5. Quality gates remain. The workflow still ends with human review, human judgment, and human accountability. AI accelerates the early stages. It does not change who is responsible for the final work.

The opportunity:

A pitch that used to require pulling designers off active projects can now be explored with AI-generated concepts in hours, not days. A creative director can show a client three visual directions before anyone has committed to building them. A mood board that used to require stock image research can be generated directly from a creative brief.

The time saved is real. The risk is manageable with clear discipline. The combination gives GES creatives an edge in the RFP process and a faster path from brief to direction.

Use the tool. Respect the boundaries. Keep humans in the loop where humans belong.