Adding another item to the virtual gallery of mid-century modern pieces that were part of my childhood. My mother used a knee chair at her desk in our home. I don’t know if it was an original “Variable Balans” by Peter Opsvik, but it looked very much like this one currently for sale at simplymod’s eBay shop. Sitting in a kneeling position is supposed to be good for your back. Its ergonomic value could be debated, but this chair is undeniably good for your eyes.
Update: Luanne of Backcare Basics, an ergonomic seating source in Massachusetts, has created a Flickr group dedicated to Varier (formerly Stokke). Here’s an example of a newer Variable Balans from the group: