I really like the idea of placing a cube on its corner. I originally had a similar idea to this with the inspiration coming from dice. Rather than making a simple cube, I could experiment and try to make a more interesting shape but with a similar idea.
Working Alone with Plywood - Woodworking Techniques - American Woodworker Tie a loop in each end of a 12 ft length of plywood. With the sheet up against a wall, slip a loop under the bottom corners. Normally you'd lift it from he same side as the rope.