Several years ago, I did try stacking them, but couldn't get it to work properly.
The folded "corners" do not neccessarily fit with each other.
I'd seen a chihuly exhibition in the V&A, and liked his stacking things in layers to create a 3-D collage of glass to occupy a space, I was trying to fill my kitchen window sill.
You need glass that has been properly made to stack, to make 3-D collages with it.