Thanks to core 77 for drawing our attention to Monarchy Rocking Stool by Greek designer Yiannis Ghikas. In the desigers own words:
Monarchy is a stool, it is a rocking stool.The swivelling function is probably the best
It rocks sideways and it rocks back and forth. Monarchy also swivels.
Monarchy is designed not to be overturned but at the same time allows the user to escape the dullness of the ultimate stability.
Judge for yourself in the nice little product video....