Unlike other mice, Evoluent's VerticalMouse 3 stands vertical to locate your hand in a handshake position, or where the arm is in 90-degrees form from the tabletop.

Shouldn't be too hard...
by niceone (992278)

Shouldn't be too hard to convert a regular optical mouse to do this. I think all you'd need was a hammer and some duct tape. But you could say that about most things I suppose.