This light projector casts an ever-changing animation of the phases of the moon onto your wall.
The moon phase projector from Banpresto can project a 2 foot diameter moon image from about 6 feet away. The projector gradually changes between all of the lunar phases over the course of about an hour.
The projector is supposed to sell for ¥3675 (appx. $31 USD), but I haven’t found a retailer who’s carrying these yet. You might want to check with Himeya Shop, since they import other Banpresto lighting products.