This vintage, retro engraving-style design features Hallucigenia with its distinctive dorsal spines, paired with the humorous phrase “still not sure which end is up.” Rendered in black and gray on a warm cream background, it celebrates this unusual marine invertebrate from the Cambrian Period and the scientific debate that once surrounded its body orientation. Made from 100% ring-spun cotton (high-quality cotton) with a soft, sensory-friendly feel. Every order funds kelp restoration on the Pacific Northwest coast.