hand-drawn holograms

See Scratch-holograms can be made upon CD/DVD cases or other soft plastic using a couple of thumbtacks poked through a stick. Or get fancy and use a professional compass and black-painted polycarbonate plates. Or automate the process with a paperclip stuck into a motorized electric eraser, or a CNC mill with a drag-engraving tool. For lots of hints, see Best is to use a good $10 compass, soft plastic that’s slightly greasy, and rep