Broom and personal computer: what they have in common

1. Step 1. Broom — evolved from — Basket. Weaving twigs.
2. Step 2. Basket — works like — Textile. Weaving twigs is a relative of weaving cloth.
3. Step 3. Textile — includes — Felt. Felt is cloth without threads: wool is matted until the fibres lock.
4. Step 4. Felt — is material for — Piano. The hammers are covered with felt.
5. Step 5. Piano — has part — Keyboard. A keyboard.
6. Step 6. Keyboard — is part of — Personal computer. A keyboard.

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