Pip was born into a world of endless blue, a shimmering 1 mm speck of potential drifting in the current. Unlike the stationary, colorful "adults" anchored to the reef below, Pip was a , built for a single, desperate mission: to find a home.

Pip did not eat. He had no mouth and no stomach. He was a living battery, powered only by the energy his mother had packed into his cells, and he knew—in the way a cluster of neurons can "know"—that time was running out.

The is a tiny, free-swimming larva that represents a fleeting moment of mobility in the life of a sea squirt. Though it measures only about 1 mm and lives for just a few days, it possesses complex features—like a primitive spinal cord (notochord) and a simple brain—that it will eventually digest to become a stationary adult. The Great Descent of Pip

A "light-eye" that told him to swim away from the bright surface where predators lurked.

A "gravity-sensor" that pulled him toward the safety of the dark seafloor.