Pipe organ and voltaic pile: what they have in common

1. Step 1. Pipe organ — has part — Keyboard. Manuals were the first keyboards.
2. Step 2. Keyboard — is part of — Laptop. The keyboard is built into the laptop's case.
3. Step 3. Laptop — has part — Lithium-ion battery. A battery.
4. Step 4. Lithium-ion battery — evolved from — Lead–acid battery. The lithium-ion battery is the next generation of rechargeable chemical current sources, with higher specific energy.
5. Step 5. Lead–acid battery — evolved from — Voltaic pile. Planté’s battery developed the idea of a chemical current source by making it rechargeable.

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