concertina paper garland decorations, hung in abundance from corner to corner of the ceiling each christmas in our house, each time i decorate the lounge for mum & dad can still see the tell tale pin holes in the ceiling! ! !
From my understanding of pinhole cameras, is that it only has a simple camera without a lens and with a single small aperture. With the hole so small, the in my opinion makes the images look like a zoomed in magnified glass image.