To help reduce spam while keeping things accessible for healthcare professionals, please answer this simple question:
Visual Illusion Challenge
What do you see in this image?
💡 Look at the whole image - what object do you recognize?
Why This Visual Challenge?
I was getting absolutely bombarded with spam bots and AI-generated sales pitches. Traditional CAPTCHAs are getting cracked left and right, so I built something more interesting - a visual illusion challenge that exploits the fundamental differences between how humans and machines process visual information.
How This CAPTCHA Works
Visual Illusion Technology: Unlike traditional text-based CAPTCHAs, this system uses well-researched visual illusions that exploit fundamental differences between human perception and computer vision:
- Human Visual Processing: Your brain automatically processes these illusions due to evolutionary visual perception patterns
- AI Limitations: Current AI systems struggle with perceptual illusions because they analyze images pixel-by-pixel rather than using human-like gestalt perception
- Dynamic Generation: Each wrong answer generates a completely new challenge from our library of 12+ different illusion types
Why It’s More Effective:
- LLM-Resistant: The system includes “inducement prompts” - misleading text designed to trick language models into selecting wrong answers
- Brute Force Protection: New challenges prevent automated attempts to solve through trial and error
- Accessibility: Visual illusions work across languages and don’t require typing or complex interactions
- User-Friendly: Most humans solve these intuitively within seconds
Technical Background
This implementation is based on research in computational vision and the IllusionCAPTCHA framework, which demonstrates that classic optical illusions remain one of the most reliable methods for distinguishing human perception from artificial intelligence systems.