A wooden yardstick
A wooden 1-foot ruler
piece of wood to serve as cross-piece, about the size of the ruler (a 2nd ruler is OK too).
A thick paper (manila) folder, which will be cut up.
(Optional) An empty cardboard box from cereal, frozen food, etc., with a glossy side. If not available, cardboard from the manila folder may be used.
4-6 rubber bands
A stapler
Two paper clips, and some paper.