I've got my little truck...and I can move the paper to different distances within the body so it's either closer or farther away from the pinhole. I've not yet experimented with that yet... I *did* find a tin from some Boy Scout chocolate toffee popcorn. (Yummy. I want more of that!) What's the 'perfect' or best size paper to fit in the tin? (I plan on using a much smaller pinhole using part of a pop can and a smaller sewing needle.) My other question is this: Does the paper sit against the curved back of it or is it better to have a curved plane, meaning instead of the paper curved with the tin but having something in the tin to have the paper curve in the opposite direction so that when you're looking down on the paper and tin, it looks like an oval? Thanks!