One of the rewards of writing a blog is the occasional detailed comment that readers (yes, this blog has more than one casual reader) send in. One such comment was elicited by my earlier post “The World is (Information) Fat.”
Uday wrote in:

Want to have some fun and waste time and learn all at the same time? Check out these optical illusions.
When I come across these sorts of things, I cannot stop marvelling at the amazing power of the world wide web.