Boolean algebra and chisel: what they have in common

1. Step 1. Boolean algebra — is used in — Relay. Shannon showed that relay circuits implement Boolean logic.
2. Step 2. Relay — is part of — Traffic light. Relay controllers.
3. Step 3. Traffic light — has part — LED. LEDs.
4. Step 4. LED — is part of — Street light. LEDs.
5. Step 5. Street light — is part of — Tunnel. Lighting.
6. Step 6. Tunnel — uses — Chisel. Hezekiah’s Tunnel was cut by hand with chisels.

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