Brass Kaleidoscope

— fps · drag the eyepiece to turn the tube · scroll to fine-turn · ← → turn · space shake · double-tap or f for fullscreen · s snapshot · on a phone, gravity follows the phone itself · Object → Camera turns it into a teleidoscope, pinch to zoom the lens

Built the way Brewster's original works: two front-surface mirrors meet at an angle, and whatever sits in the wedge between them is reflected around the apex. 60° gives six-fold symmetry, 22½° gives sixteen. The glass lives in a backlit cell at the far end and tumbles under gravity as you turn the tube, so no pattern ever comes back.

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