Handwritten mathematical formulas and equations densely cover a deep navy ground, their white chalk-like markings creating an intricate, layered texture across the entire composition. The effect is contemplative and intellectual, evoking the visual language of a blackboard or scholar's workspace where complex thinking unfolds. 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.