I could easily see this being like the classic "orange" captcha - block robots by raising the bar to ankle height. Actually testing the "correctness" of these s

I could easily see this being like the classic "orange" captcha - block robots by raising the bar to ankle height. Actually testing the "correctness" of these submissions would be far more complex and resource intensive than typical captchas, and could weed out people who simply don't have a good eye for colour.