Pneumatic pushers and electric fan: what they have in common

1. Step 1. Pneumatic pushers — is part of — Player piano. They press the keys when signalled by holes.
2. Step 2. Player piano — is made of — Paper. The program is a perforated paper roll.
3. Step 3. Paper — is material for — Hot air balloon. It was lined with paper on the inside.
4. Step 4. Hot air balloon — uses — Convection. Hot air rises and fills the canopy.
5. Step 5. Convection — is used in — Air fryer. Hot air.
6. Step 6. Air fryer — has part — Electric fan. A fan.

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