7 ms·

This is similar to CAPTCHAs being used to scan books. Smart idea. Wouldn't be surprised if that's where it got its inspiration.

• joshwa 19y ago
  or hotcaptcha or petcaptcha... http://www.hotcaptcha.com/ http://www.hotcaptcha.com/ http://research.microsoft.com/asirra/ http://research.microsoft.com/asirra/
• vlad 19y ago
  I had the same thought.