"Sit up straight on the chair!". How many times were we told that by our mother? How many times do you think that while working at the desk with absurde and unhealthy positions?
WOOJING CHUNG found the solution to this ancient problem by shortening the seat of his chair. The half seating prevents you from sliding and taking a semi-recumbent position. Of course, this is not the solution for occasions when you must sit very long -when you want to relax you'd better choose a chaise long-.
For compact study or work units, however, this idea makes sense. Sit up straight on the chair and keep on working!