FPGA and oil lamp: what they have in common

1. Step 1. FPGA — has part — Logic gate. Programmable logic blocks.
2. Step 2. Logic gate — is part of — Flip-flop. A flip-flop is made of gates.
3. Step 3. Flip-flop — has part — Vacuum tube. The first flip-flop used vacuum tubes.
4. Step 4. Vacuum tube — is made of — Tungsten. The cathode is a tungsten filament.
5. Step 5. Tungsten — is material for — Incandescent light bulb. A tungsten filament (since 1904–1910).
6. Step 6. Incandescent light bulb — evolved from — Oil lamp. The electric lamp replaced oil and gas lamps.

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