I like it a lot, and I think the reason is that it confounds expectations. Usually when I see graffiti it’s just some stupid pen name scrawled on a wall and I think to myself, Jerkwad kids. This is… weirdly smart, though. Some kid tagged the Pythagorean theorem on a wall?
OK, I don’t know that a “kid” did it, but I’d like to think it was. I’ve found myself thinking about this particular tag off and on in the last few weeks, wondering what the person who created it was thinking. They were probably thinking, “Some guy will find this humorous and Instagram it.” Well one point you, if that’s what you thought, but two points for making my brain gears turn for a while.