Captcha is a necessary evil. It takes up time and makes users go through more steps than they’d necessarily want to in order to do whatever it is that they want to do: post a comment, sign up for a service, etc. Without it, though, one’s site can fill up with all kinds of spammers. What makes this project so interesting is the application of proving one’s humanness in the physical world. What does that communication of something purely technological into a physical presence convey to passers-by? Do they get it? How do you prove that you’re human in this situation? There is no input field. I would love to see someone interact with this. Maybe they could break it apart to form a real word or copy the captcha below it. Well, something more interesting and creative than that would be better, but I think the captchas are just begging to be played with.