As far as I know it’s just cardboard, wood and glass
In: Physics
Cardboard, glass, and mirrors! They make a tunnel out of mirrors – usually three to form a triangle–then either allow you to see through it or put a membrane over the other end to scatter light and fill it with colorful beads so you get a bunch of colors instead.
When you look down the tunnel of mirrors, you see the strange patterns of the fractal reflections it creates into infinity (or as far as it can go) from all the light then bouncing around inside the scope and rerererere-reflecting the same image over and over again.
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