CAPTCHA and windlass: what they have in common

1. Step 1. CAPTCHA — uses — Optical character recognition (OCR). Distorted text that is hard for OCR.
2. Step 2. Optical character recognition (OCR) — uses — Image sensor. Scanning.
3. Step 3. Image sensor — is part of — Smartphone camera. A CMOS sensor turns light into a digital image.
4. Step 4. Smartphone camera — is part of — Lunokhod. TV cameras.
5. Step 5. Lunokhod — has part — Wheel. Wheels.
6. Step 6. Wheel — is used in — Windlass. A windlass is a wheel and axle used as a simple machine.

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