Analog-to-digital converter and conveyor belt: what they have in common

1. Step 1. Analog-to-digital converter — is part of — Image sensor. The pixel signal is digitized.
2. Step 2. Image sensor — is part of — Trackball. An optical sensor of the ball’s motion.
3. Step 3. Trackball — has part — Ball bearing. The ball rotates on supports.
4. Step 4. Ball bearing — is part of — Conveyor belt. The rollers turn on bearings.

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