Hard light
An assortment of lenses and shapes cut from glass and clear perspex, lying on a bed of dusty cotton wool inside a box that might be as old as I am. They were originally made to demonstrate the simple magic of making rainbows and explain ray optics to students. Now, they lie unused and unloved on a desk in a laboratory.
These are the kinds of unusual treasures you can find lying around in a Physics department.
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