Kaleidoscope and multistage rocket: what they have in common

1. Step 1. Kaleidoscope — has part — Mirror. Mirrors.
2. Step 2. Mirror — is part of — Solar concentrator. Mirrors concentrate the light.
3. Step 3. Solar concentrator — has part — Steam turbine. Heated steam turns a turbine.
4. Step 4. Steam turbine — evolved into — De Laval nozzle. De Laval invented the nozzle for a steam turbine.
5. Step 5. De Laval nozzle — is part of — Liquid-propellant rocket engine. A nozzle.
6. Step 6. Liquid-propellant rocket engine — is part of — Multistage rocket. Engines on every stage.

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