Why oh why are we still depending on optical character recognition to tell people and computers apart? There are so many visual things people can do well and co

Why oh why are we still depending on optical character recognition to tell people and computers apart? There are so many visual things people can do well and computers can't. Just look at KittenAuth! Granted, you need something with pretty bad odds for random guessing, but it seems to me people aren't thinking outside the box enough on this one.