You're absolutely right. I went to the hardware store and had them cut me a 3 1/2 inch square out of plexiglass, (they gave it to me for free because they made it out of scrap). When I got it home I scratched the 2 lines on it, I drew along the scratch with a magic marker, wiped off the excess, then taped clear tape over the scratch. Ta Da! I think I found the paper pattern on a site where they called it 'square dance'