Joystick stick and hammer: what they have in common

1. Step 1. Joystick stick — is part of — Joystick. A hinged lever.
2. Step 2. Joystick — has part — Spring. They return the stick to the centre.
3. Step 3. Spring — is part of — Automaton. The mainspring stores the energy.
4. Step 4. Automaton — has part — Cam. Cams set the figures’ movements.
5. Step 5. Cam — is part of — Trip hammer. Cams on the shaft lift the hammer.
6. Step 6. Trip hammer — evolved from — Hammer. A trip hammer is a hammer lifted and dropped by a water wheel.

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