The blue dots represent air molecules. When sound travels, molecules don't move forward — they vibrate in place, creating alternating regions of compression (bunched together) and rarefaction (spread apart). This pattern of pressure changes travels through the air as a wave.
Try it: Increase frequency to hear a higher pitch. Increase amplitude to make it louder.
Everything stays mechanical until the final step. The vibration travels through solid materials (string, bridge, body wood) until the body pushes on the air, creating the pressure waves your ear can detect. The body acts as a built-in amplifier and filter.
Vibration becomes electrical signal early in the chain. The pickup captures string movement and converts it to voltage. This signal can be processed, shaped, and modified before a speaker converts it back to mechanical energy (air movement). The body doesn't make sound — the speaker does.