How the previous picture was made:

You need 2 mirrors, transparant tape, and ducttape.
Lay the to mirrors together, with the reflecting side on the inside.
Tape the outside with the ducttape. Then, tape the inside with the transparant tape.

The corner of the two mirrors are what seems to be the center in the mathematical equilateral shapes (ik hoop zo de juiste vertaling gevonden te hebben van de gelijkzijdige veelvlakken)
If the angle of the two mirrors is 90 degrees, the shape appears as a square
If the angle of the two mirrors is 72 degrees, the shape appears to be a pentagon
and so on and so on

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