A few weeks ago, the podcast "99% Invisible" did an episode about how all great architects and designers try to reinvent the chair. (Find it here; it was really good). in which they said
The chair presents an interesting design challenge, because it is an object that disappears when in use. The person replaces the chair.
Mr F is turning everything designers know on their head. He is the disruptive force that sitting has been fearing for all of human existence.