Jellyfish are gelatinous marine animals, not true fish. Their soft, often bell-shaped bodies pulse to move through the water, though many also drift with currents. Tentacles around the bell carry specialized stinging cells that help capture tiny prey, such as plankton, and provide defense; the strength of a sting varies among species. Jellyfish live in seas around the world, from coastal waters to the open ocean, and their shapes, sizes, colors, and tentacle lengths differ widely. Many species have a life cycle that alternates between a free-swimming medusa stage-the form commonly called a jellyfish-and a small attached polyp stage. The collection focuses on jellyfish, with examples described in blue, rose, and grey tones, reflecting some of the varied colors associated with these marine animals. Different depictions can highlight their rounded bells and trailing tentacles, the features that make jellyfish recognizable.