Sprung is certainly a bizarre chair, a chair designed for very special people who seek out the conventional. Is yellow and I especially remember a mat. I do not know, I get the feeling that if you sit down you can go out leaving propelled forward.
The fact is that there is no denying that it is also joyous, exciting or surprising adjective you have used its creator, New Zealander Jason Klenner, to define it.
The chair in question was manufactured in limited edition, so get one of them is anything but easy. Been used to manufacture 65 meters cord hand sewn with elastic properties.