Hat crown and industrial robot: what they have in common

1. Step 1. Hat crown — is part of — Hat. The upper part.
2. Step 2. Hat — is made of — Felt. Felt.
3. Step 3. Felt — is material for — Piano. The hammers are covered with felt.
4. Step 4. Piano — includes — Player piano. A piano.
5. Step 5. Player piano — uses — Program control of a machine. The tune is recorded on a perforated roll.
6. Step 6. Program control of a machine — is used in — Industrial robot. The movements are recorded in a program.

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