The whole semantic-whitespace thing in Python is genius if you think about it. I mean, it's horrible - awful to use, makes a hash of copy&paste and makes emailing code around (which I guess is a bad idea but anyway) impossible. BUT, and this is the genius part, one of the endless will-never-be-settled arguments that programmers love to have is the one about indentation. If you build a position on this argument actually into the syntax of the language, then the language will always be part of the argument and thus will always be talked about. And thus always popular.
Prior to Python I would have thought that such an achievement would be impossible, but the genius of actually making *whitespace* part of the language definition pulled it off.
Genuis truly is the only word for it.