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What it is: Quasicrystals as sums of waves in the plane, as this blog explains.
What it is: Subtractive color theory, or CMYK dots, which are used in color printing.
What it is: The Penrose triangle, also known as an impossible triangle.
What it is: Pendulums (or pendula, if you prefer Latin plurals). The period of a pendulum depends on its length, as Discover magazine shows.
What it is: Spinning octahedra.
What it is: An infinite-loop equation from Reddit user Fruchtfliege that would fill the universe in after about 1.5 minutes or about 28 cycles (or at least until the bottom brick is crushed).
What it is: Rotating cubes.
What it is: An experiment with a burning fuel droplet on the International Space Station.
What it is: Snake.
What it is: A simple pyramid.
What it is: A color vortex.
What it is: A hyperboloid, or a doubly-ruled surface for the math-inclined.
What it is: A Moiré pattern, or an interference pattern made when two repetitive surfaces overlap and are moved around. You can play around with some here.
What it is: A Sierpiński triangle fractal.
What it is: Dots moving along straight lines. The proof!