One of my all-time favorite Tumblr sites, featuring plenty of pictures of crazy walls.

And this Esquire article is the definitive reference sheet on the crazy wall as a phenomenon.

Call me crazy, but I’ve been getting into crazy walls lately. Not sure why I never tried one before. There’s something about the physicality of it, to draw out a complicated idea and it’s many features and functions as an entity in space, with literal connections. The string is such a key element. It’s more than a mind map. Is there a ‘crazy wall’ online app?

CWaaS - Crazy Wall as a Service