Amphitheatre and kite: what they have in common

1. Step 1. Amphitheatre — works like — Stadium. The Greek stadium is older than the Roman amphitheatre; modern stadiums combine both layouts.
2. Step 2. Stadium — has part — Retractable roof. A retractable roof.
3. Step 3. Retractable roof — has part — Truss. Trusses.
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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