The rig that IKEA put a Series POANG chair in to demonstrate how rugged the chairs are. It used pneumatic cylinders to simulate the pressure of use. (Personally, I still wouldn't sit in them because I just feel like I'd flip it over.)
Ben Schumin is a professional photographer who captures the intricacies of daily life. This image may be used under Creative Commons Attribution-ShareAlike 2.0. Please provide artist attribution, as well as a link to the original photo and to the license terms.