Image sensor and plumbing: what they have in common

1. Step 1. Image sensor — has part — Photodiode. A sensor pixel is a photodiode.
2. Step 2. Photodiode — is part of — LIGO. A photodetector of the interference.
3. Step 3. LIGO — is made of — Silica (sand). The mirrors are fused silica.
4. Step 4. Silica (sand) — is material for — Water filter. Slow filters are layers of sand and gravel.
5. Step 5. Water filter — is used in — Water treatment plant. Sand filters.
6. Step 6. Water treatment plant — is used in — Plumbing. Treated water.

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