The Lost in Sofa by Daisuke Motogi has little built-in slots in which you can stuff some goodies.

From the designer:

Things often get lost under the sofa. It’s ordinary for a coin which slipped out of your pocket, or a never-to-be-found remote to be accidentally found in between/underneath the sofa cushions. Maybe you’ll find a forgotten 10,000 yen bill that you once hid in there…

Photos by Takahumi Yamada.
Illustration by Noritake.