I was rather impressed when I saw this chair.
This is the first one I have ever seen, last month while in Orkney.

If the concept of a library chair is new to you then I implore you to look closely at the chair in step mode. The hinge allows the upper half of the steps to flip back thus making the top step lie flat with the floor to reveal the erm, chair.

Well I am in awe. This one is from the late 1800s!