How do etch-sketch sketch?

Answer:
The Etch-A-Sketch contains very fine aluminum powder, which sticks to the glass. The knobs are connected to wires and pulleys, which move a plastic stylus vertically and horizontally. The stylus scrapes a tiny amount of the aluminum powder off the glass, leaving a visible line. If you draw all over the screen and clear away all the aluminum powder, you can see the mechanism inside.
First answer by JazzHarper. Last edit by JazzHarper. Contributor trust: 81 [recommend contributor recommended]. Question popularity: 1 [recommend question].