Ah, these are actually known as pathing wheels, a replacement part for standard office chars. Originally, advertisers were pushing for "More productive employees, rolling around the office faster, able to create their own groove paths in the floor."

The basic idea was that if you rolled back and forth to a spot really quick, then you'd make a nice grove to quickly and directly move to your location. However, when many employees started doing figure-eight paths, many would fall out of their chairs, resulting in lawsuits. It's a real shame, because I could definitely use these to carve myself a path to the cafeteria right now.