Birk loved a good pun, and went as far as to illustrate some through small models like these. From the upper left going clockwise in the photo, these pieces are titled: “Dead Bolt” (bolt in a wooden coffin), “Stool Sample” (tiny wooden stool in film canister), “Tax Shelter” (two carpet tacks under an overhang of wood), “Quarter Pounder” (clothes pin with a hammer attached hitting a quarter coin), two different “two-headed bolt puzzles,” and “Diamond Ring” (A dime and a bell—dime and ring).