Waterproof plaster lining and zip: what they have in common

1. Step 1. Waterproof plaster lining — is part of — Cistern. Plaster on hydraulic mortar.
2. Step 2. Cistern — is made of — Stone. Cisterns were cut into rock or lined with stone.
3. Step 3. Stone — is material for — Adze. The blade of an adze was ground from stone.
4. Step 4. Adze — uses — Wedge. The blade of an adze is a wedge.
5. Step 5. Wedge — is part of — Zip. The slider works like a wedge, bringing the teeth together and pushing them apart.

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