> There are even people out there who, using nothing but a compass with a
> sharp tip, cut patterns into acrylic glass to produce simple
> stereographic images (point clouds actually).
>
> And yes, it appears to actually work.

You can often see holograms in the paintwork of cars on a sunny day, it 
looks like an odd lens flare effect that is hovering some distance above 
the paintwork. It is caused by poor washing technique which drags grit 
across the paint creating tiny (but nothing like the wavelength of light 
tiny) grooves in the paint.

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