# Optical Illusion Book — Interactive Visual Illusions

> Interactive Visual Illusions (iPhone/iPad app by Mishima Design.)

- Source: https://appshunter.io/ios/app/optical-illusion-book/id6801408868 (this page in markdown: same URL + `.md`)
- Developer: [Mishima Design](https://appshunter.io/developer/373060551)
- Category: Education, Entertainment
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 18.0 · 4 MB
- Languages: American English, French (France), German (Germany), Indonesian, Italian, Japanese, Korean, Brazilian Portuguese, Chinese (Simplified, China), European Spanish and 2 more
- Released: 2026-08-19
- Data updated: 2026-09-04
- User reviews in markdown: https://appshunter.io/ios/app/optical-illusion-book/id6801408868/reviews.md

## What is Optical Illusion Book?

Do equal lengths and identical colors always look the same?

Optical Illusion Book is an interactive guide to 36 visual illusions. Move lines and shapes, then adjust angle, size, speed, color, spacing, and other conditions to see how perception changes.

ILLUSIONS INCLUDE
• Size & Length: Müller-Lyer, Ebbinghaus, Ponzo, and more
• Angle & Shape: Zöllner, Café Wall, Fraser Spiral, and more
• Color & Brightness: Checker Shadow, Hermann Grid, Cornsweet, and more
• Motion & Timing: Apparent Motion, Flash-Lag, Barber Pole, and more
• Adaptation & Attention: Motion Aftereffect, Troxler Effect, Afterimage, Peripheral Drift, and more
• Figure, Ground & Depth: Rubin's Vase, Necker Cube, Kanizsa Triangle, and more

FEATURES
• Interactive demonstrations for all 36 illusions
• Depending on the illusion, drag shapes together, switch views, or play and pause animations
• Adjust conditions with sliders and observe how the effect changes
• Reveal the underlying image and learn why the illusion occurs
• Save favorites and filter the catalog
• Switch between detailed standard explanations and Easy Language with simpler wording
• Furigana in Japanese when Easy Language is enabled
• Light and Dark Mode support

Müller-Lyer, Ebbinghaus, and Ponzo are free to use. A one-time Complete Collection purchase unlocks all 36 illusions and every experiment feature. There is no subscription.

Visual effects vary from person to person. Stop using the app if viewing an effect causes discomfort.

Terms of Use: https://apps.mishimadesign.com/opticalillusion/legal.html#terms-en
Privacy Policy: https://apps.mishimadesign.com/opticalillusion/legal.html#privacy-en

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Complete Collection | $14.99 | one-time |



## Version history (last 1 release)

### 1.0 — 2026-08-20

No release notes.

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- [CheckOne](https://appshunter.io/ios/app/checkone/id6785709065)

All apps by Mishima Design: https://appshunter.io/developer/373060551

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-04.*