Spear-thrower and industrial robot: what they have in common

1. Step 1. Spear-thrower — uses — Spear. It throws darts.
2. Step 2. Spear — evolved into — Fire lance. The fire lance was a spear with a tube of gunpowder — the first step to firearms.
3. Step 3. Fire lance — is made of — Paper. The barrel of a fire lance is a paper or bamboo tube.
4. Step 4. Paper — is material for — Bouchon’s loom. The program is a perforated paper tape.
5. Step 5. Bouchon’s loom — uses — Program control of a machine. A perforated tape set which threads to raise.
6. Step 6. Program control of a machine — is used in — Industrial robot. The movements are recorded in a program.

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