Billiard cue and elevator: what they have in common

1. Step 1. Billiard cue — is part of — Billiards. A stick for striking.
2. Step 2. Billiards — uses — Newton’s laws. Collisions of balls.
3. Step 3. Newton’s laws — is used in — Truss. A triangle is a rigid shape.
4. Step 4. Truss — is part of — Eiffel Tower. Lattice trusses.
5. Step 5. Eiffel Tower — has part — Elevator. Lifts.

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