Cloud computing and bellows: what they have in common

1. Step 1. Cloud computing — uses — Virtualization. Virtual machines.
2. Step 2. Virtualization — uses — Mainframe. IBM mainframes.
3. Step 3. Mainframe — uses — Punched card. Programs were entered on punched cards.
4. Step 4. Punched card — works like — Pinned cylinder. Pins on a cylinder and holes in a card are two ways of recording a sequence for a machine.
5. Step 5. Pinned cylinder — is part of — Barrel organ. A pinned cylinder sets the tune.
6. Step 6. Barrel organ — has part — Bellows. Bellows feed air into the pipes.

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