The Art of Instruction (Chronicle Books) is quite an odd, beautiful and oddly beautiful book. I first read about it in a magazine while sitting in a doctor's waiting room and was possessed by a wild desire to own it, based mainly just on the beautiful cover. The book is a collection of vintage educational posters and is the work of Katrien Van der Schueren, owner of voila! Gallery in Los Angeles.
You can read more about it at Design Sponge, but here's a little peek in case the cover wasn't tempting enough for you.
I see from the Raincoast site that there are also notebooks and postcards available for order!