Two detailed cross-sections of an oyster shell fill this cream-colored page, rendered in sepia and brown ink with precise scientific observation. The upper figure shows the oyster's exterior profile while the lower reveals its interior anatomy, with delicate linework defining the soft tissue, ridged shell texture, and organic chambers in the naturalist tradition of 19th-century scientific illustration. Printed on smooth white card stock and made to order, artwork on the front, blank inside, envelopes included in every set. A handwritten note that arrives as an independent artist's work.