People puzzled over them… until the internet found out what they were used for.

An internet user discovered a strange piece of furniture: The top can be opened to an empty space and appears to be tiltable.

It is actually a convertible desk. A metal rod supports the wooden tabletop, allowing it to be tilted to various angles. This system is ideal for comfortably reading, writing, or reviewing documents, similar to sitting at a lectern.

  1. The mysterious little door within the door