Elevator and aeroplane: what they have in common

1. Step 1. Elevator — is part of — Eiffel Tower. Lifts.
2. Step 2. Eiffel Tower — has part — Truss. Lattice trusses.
3. Step 3. Truss — is part of — Space frame. Space trusses.
4. Step 4. Space frame — evolved from — Kite. Bell came up with the structure while building tetrahedral kites.
5. Step 5. Kite — evolved into — Glider. Lilienthal and Cayley studied the wing with kites and gliders.
6. Step 6. Glider — evolved into — Aeroplane. The Wrights added an engine to a glider.

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