A dense taxonomic study of sea urchin anatomy rendered in gold, red, and teal linework against a black ground displays cross-sections, spinal structures, and detailed biological forms labeled A through J. The composition balances geometric precision with organic complexity, presenting both the creature's exterior spikes and interior chambers in a style that merges scientific illustration with modernist graphic sensibility. At home in a naturalist's study, a marine biology classroom, or a curiosity cabinet. Printed to order on smooth 100lb gloss paper, then rolled into a tube and shipped ready to pin, tape, or frame. Sized to fill a wall without filling the budget. The same independent-artist artwork you'd frame, at poster scale and poster price.