Cut flaps off box.
Trim box to desired height (ours was about 4 inches).
Cut a piece of tracing paper that fits one side of the box.
Use Scotch tape to attach the tracing paper to one open side of the box.
Cut a strip of Mylar a little bit taller then the height of your box.
Cut strip into random lengths.
Roll Mylar piece into a tube and tape along edge.
Place in box and repeat until you have tubes of varying diameters snugly fit together in the box.
Measure and cut transparent plastic sheet to fit on the open side of the box.
Tape the plastic piece onto the cardboard box on the side opposite the tracing paper.