Several marine animals have larval stages with complex morphologies and intricate patterns of ciliation. These larvae utilize ciliary beating for swimming and feeding at low Reynolds numbers. The spaceship-shaped sea urchin larva shown above generates a fascinating multi-vortex flow under confinement. Time-lapse images from darkfield microscopy were visualized using Flowtrace, and the pathlines were rendered in blue color. The scale bar is 100 μm.