I’d like this to be visually stimulating, and a direct relationship of input to output.
Some inspiration: Turritopsis Nutricula. A species of jellyfish that is theoretically biologically immortal, able to “rebirth” itself.
Potential idea: glowing jellyfish-like orb that responds to users via infrared proximity sensor. When user comes close enough, the jellyfish retracts its tentacles and dims light & darkens hue: “rebirthing” itself. It then extends tentacles again and grows brighter, and continues to “breathe” (LEDs fading in and out) until it is provoked again.