Two human skulls rendered in precise anatomical detail occupy a black ground, their surfaces etched with Latin labels identifying every bone, ridge, and cavity from multiple angles. The grayscale engraving technique creates a clinical yet dramatic study, emphasizing the geometric structure of bone through fine line work and subtle shading that gives the forms sculptural weight. 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.