Near the surface of the open sea, a worm-like creature releases the delicate cage it had built around itself. Out of its own mucus, the 3-centimeter-long creature --known as a giant larvacean-- had crafted an elaborate house containing chambers within chambers. The sticky, soap-bubble-like chambers captured plankton, protozoa, bacteria and other tidbits from the diverse life swimming in the twilight sea. But the chambers have become clogged with more food than their tenant can eat. The giant larvacean drops its cage and begins to craft another--for the third time today.