DLP chip and voltaic pile: what they have in common

1. Step 1. DLP chip — is part of — Digital projector. A DLP chip.
2. Step 2. Digital projector — evolved from — Film projector. Digital projection.
3. Step 3. Film projector — has part — Incandescent light bulb. The light source (formerly an arc).
4. Step 4. Incandescent light bulb — is part of — Torch (flashlight). A bulb (today an LED).
5. Step 5. Torch (flashlight) — has part — Dry cell. Batteries.
6. Step 6. Dry cell — evolved from — Voltaic pile. A convenient form of the galvanic cell.

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