Designer, Nicole Van Schouwenburg and Irene Klinkenberg ZHO Created "The Selfshelf." It is a shelf with the size and the appearance of a book. It can be simply and invisibly attached to the wall using the supplied bracket and used to support a stack of books.
Inspired by my last post I tracked down this Perpetual wall calendar by Enzo Mari. Central section in walnut, strips in ramin, steamed beech and maple.
Both products are available at TwentyTwentyOne.