We've posted several 'Scanimation'/barrier grid animation books on the Animated Review in the past. The technique requires a special acetate foil to be passed back and forth across an image seemingly bringing it to life. We love that with the aide of interactive and magical optical effects you can breath new life into a printed book, a format which is quickly being usurped by digital variations.
'Little Zoo' by Kveten is a wonderful example of how barrier grid animation can add a new level of charm and intrigue into an otherwise simple publication. We're unaware if this book is available for purchase anywhere, but we'll update this post should we find it up for sale.