Originally Posted by cobby
I'm thinking you make a "window" layer
This is a great idea and there's probably a simpler way than the one Cobby describes. The acetate doesn't actually need to be the shape of the bell jar for this so you can do away with the need to hand cut templates etc - just cut the jar from carstock and then put a piece of acetate behind the aperture you just created. The acetate can be rectangular like the cardstock piece and you can use adhesive anywhere on the cardstock without it showing.