Broom binding and camera: what they have in common

1. Step 1. Broom binding — is part of — Broom. It binds the bundle.
2. Step 2. Broom — is made of — Plant fibre. A broom is tied from twigs and grasses.
3. Step 3. Plant fibre — is material for — Hygrometer. Humidity was shown by a fibre that changed length.
4. Step 4. Hygrometer — has part — Spring. The tension of the hair.
5. Step 5. Spring — is part of — Shutter. A spring mechanism.
6. Step 6. Shutter — is part of — Camera. A shutter.

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