I've always been fascinated with pop-up books, and will be until they come up with holographic books. I particularly like adult pop-up books, by which I don't necessarily mean x-rated ones, though I don't exclude them either. There are a couple of (inoffensively) naughty pop-up books, "The Naughty Nineties" and "The Roaring Twenties", that are quite funny. Non-naughty ones that I like include "Creatures of Long Ago: Dinosaurs", "Alfred Hitchcock - The Master of Suspense", "The Universe" and "The Human Body" by David Pelham and "Evolution" by Raymond Hawkey. I'm always grateful for recommendations.
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"If you're using half your concentration to look normal, then you're only half paying attention to whatever else you're doing." - Magneto in "X-Men: First Class"