Distillation column and LIGO: what they have in common

1. Step 1. Distillation column — is part of — Chemical plant. Separating the products.
2. Step 2. Chemical plant — is made of — Brick. The furnaces and towers are brick.
3. Step 3. Brick — is material for — Water treatment plant. Settling tanks are stone and brick.
4. Step 4. Water treatment plant — uses — Water filter. Sand filters.
5. Step 5. Water filter — is made of — Silica (sand). Slow filters are layers of sand and gravel.
6. Step 6. Silica (sand) — is material for — LIGO. The mirrors are fused silica.

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