Hang glider and gutenberg printing press: what they have in common

1. Step 1. Hang glider — is made of — Polyester. The sail.
2. Step 2. Polyester — is material for — Tensile structure. A diaphragm.
3. Step 3. Tensile structure — works like — Sail. Stretched fabric working in tension.
4. Step 4. Sail — is part of — Sailing ship. Sails drive the ship.
5. Step 5. Sailing ship — uses — Mercator projection. Navigating along straight rhumb lines.
6. Step 6. Mercator projection — uses — Gutenberg printing press. Maps were printed in large numbers.

Open Evothings