Compass legs and kite: what they have in common

1. Step 1. Compass legs — is part of — Compasses. A needle and a lead holder.
2. Step 2. Compasses — is used in — Euclidean geometry. Constructions with compass and straightedge.
3. Step 3. Euclidean geometry — is used in — Geodesic dome. The sphere is divided into triangles.
4. Step 4. Geodesic dome — has part — Truss. A triangular grid.
5. Step 5. Truss — is part of — Space frame. Space trusses.
6. Step 6. Space frame — evolved from — Kite. Bell came up with the structure while building tetrahedral kites.

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