Quote Originally Posted by Bob Salomon - HP Marketing View Post
Each leg is hinged at the top so all four legs will always be in contact with the ground. You would have a valid point if there wasn't a hinge joint at the top of the leg so the leg can pivot. Not only does each leg pivot at the top like any other tripod and each leg is also adjustable for angle.
Bob, the point is that it is a whole lot easier to get three legs to sit in a plane than four. In fact, three legs are automatically in the same plane - always. This is basic geometry. Even with hinges, it would take great effort to get all four legs to be in the same plane - which is a necessary condition for the platform to NOT wobble. If you sell any of these, I can almost guarantee the majority of the users will be dissatisfied - unless they like wobbly stools.

yet another example of an absurd product design coming from some marketing genius.