Continuous track and kite: what they have in common

1. Step 1. Continuous track — is part of — Excavator. Most excavators run on tracks.
2. Step 2. Excavator — is made of — Wrought iron. Otis’s steam shovel is iron.
3. Step 3. Wrought iron — is material for — Truss. Then — wrought iron.
4. Step 4. Truss — is part of — Space frame. Space trusses.
5. Step 5. Space frame — evolved from — Kite. Bell came up with the structure while building tetrahedral kites.

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