Another blast from my past. I still have and use this chair. I designed it when in college in 1981.
Do you have a favorite seat in your house? I've helped hundreds of students design and build original chairs. There is a greater expectation we have for chairs compared to table or cabinet designs. Structure, comfort, are not as obvious challenges when the projects holds a dynamic human. Usually there is at least one, and often two rough prototypes made before finalizing details for chair designs. A solid seat that is uncomfortable to sit in gets a "C" at best in the advanced furniture design classes we taught.
More details and background about this chair are now on my blog here.
4D