Wooden stand and plumbing: what they have in common

1. Step 1. Wooden stand — is part of — Armillary sphere. A support with a horizon.
2. Step 2. Armillary sphere — has part — Axle. The celestial axis.
3. Step 3. Axle — is part of — Yo-yo. The axis between the discs.
4. Step 4. Yo-yo — is made of — Clay. Greek yo-yos were terracotta.
5. Step 5. Clay — is material for — Plumbing. Minoan plumbing used ceramic pipes.

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