It is a book with a bunch of these kind if images, actually they aren't like these at all, they are sort of "fuzzy", but you look at them the same way. Your library might have a copy- after a couple of hours viewing it you can also get a REALLY big headache! Dare I say this here? I've done a couple more, they are in the General Discussions Forum at PoserPros. There is an explanition how they were done, too.