Two detailed scientific sketches of oyster shells rendered in graphite reveal the mollusk's internal and external structure with careful anatomical precision. The warm cream paper grounds these naturalistic drawings, capturing the ridged texture of the shells and their organic, asymmetrical forms through delicate cross-hatching and subtle shading. Built from double-wall stainless steel and made to order, holding 20 ounces with a snap-on lid, a standard-cup-holder fit, and wraparound artwork. Your commute carrying original art instead of another branded tumbler.