Roche Bobois Mistral Armchair [1], when not standing or sitting on the ball. But around here we just call it the chair. It's perilously difficult to escape fro

Roche Bobois Mistral Armchair [1], when not standing or sitting on the ball. But around here we just call it the chair. It's perilously difficult to escape from. [1] http://www.roche-bobois.com/#/en-US/products/all/armchairs/all/all/all/455/fullscreen/ http://www.roche-bobois.com/#/en-US/products/all/armchairs/a...