Spinning top body and vacuum pump: what they have in common

1. Step 1. Spinning top body — is part of — Spinning top. A massive body of revolution.
2. Step 2. Spinning top — has part — Sharp point. A fulcrum.
3. Step 3. Sharp point — is part of — Needle. It pierces the fabric.
4. Step 4. Needle — is part of — Syringe. A hollow needle.
5. Step 5. Syringe — works like — Piston pump. A syringe is a hand-operated piston pump.
6. Step 6. Piston pump — evolved into — Vacuum pump. Guericke adapted the piston pump to pump out air.

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