Woah ... went to check Rolife and then wandered into the whole genre of "book nook" kits.

Basically dioramas of the size of very thick book. You insert them between other books in the library and it gives you a peek into some alley, a house or some other scene. Incredible idea, and some are absolutely crazy beautiful. Anavrin even has a cyberpunk one !

Thanks a lot, discovery of the month :)