The Spinning Chair designed by Jaanus Osugaar and supposedly inspired by the Cern Accelerator, is a spinning-top shaped wooden cone with leather hand straps and a metal ball in its base. Yes it is. The blurb sez:
The spinning chair is the opposite to the rocking chair. When the rocking chair calms and puts you at ease, the spinning-chair energises and stimulates. The vibration from the spinning of the metal ball inside awakens your spirit and renews your cells. After 6 spins you end up where you started. It is an hilarious, irrational and playful ride for both kids and grown-ups.
You’ll need a lot of space and a conveniently-placed bucket.