Rubber shoe sole and joystick: what they have in common

1. Step 1. Rubber shoe sole — is part of — Footwear. The sole.
2. Step 2. Footwear — is made of — Plant fibre. The oldest sandals (Fort Rock) were woven from sagebrush bark.
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 — Joystick. They return the stick to the centre.

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