CMOS and barrel: what they have in common

1. Step 1. CMOS — is used in — Microprocessor. Processors are CMOS.
2. Step 2. Microprocessor — is part of — Programmable logic controller. A processor.
3. Step 3. Programmable logic controller — is part of — Chemical plant. Process control automation.
4. Step 4. Chemical plant — is made of — Brick. The furnaces and towers are brick.
5. Step 5. Brick — is material for — Arch. Arches were built of brick or stone.
6. Step 6. Arch — works like — Barrel. Staves squeezed by hoops hold their shape by the same compression as the stones of an arch.

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