Clever idea for moving sheets of plywood

Clever idea where you basically have 2 halves and lock into the board and wheels to move a sheet around.  But as one commentor pointed out, not a new idea.

http://gizmodo.com/this-rolling-bear-trap-makes-awkward-flat-materials-eas-1558383670?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+gizmodo%2Ffull+%28Gizmodo%29