Breadth-first search and paper machine: what they have in common

1. Step 1. Breadth-first search — is a kind of — Algorithm. An algorithm.
2. Step 2. Algorithm — is used in — Program control of a machine. A program is a written algorithm.
3. Step 3. Program control of a machine — is used in — Bouchon’s loom. A perforated tape set which threads to raise.
4. Step 4. Bouchon’s loom — is made of — Paper. The program is a perforated paper tape.
5. Step 5. Paper — uses — Paper machine. Industrial production.

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