Quartz clock and joystick: what they have in common

1. Step 1. Quartz clock — is made of — Silica (sand). The resonator is a quartz crystal.
2. Step 2. Silica (sand) — is material for — LIGO. The mirrors are fused silica.
3. Step 3. LIGO — has part — Photodiode. A photodetector of the interference.
4. Step 4. Photodiode — is part of — Perceptron. Photocells read the image.
5. Step 5. Perceptron — has part — Potentiometer. Potentiometers set the weights.
6. Step 6. Potentiometer — is used in — Joystick. Position is read with potentiometers.

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