A vintage patent diagram illustrates the dimpled surface and cross-section of a golf ball in precise technical detail, rendered in grayscale with fine line work and hatching. The composition is vertically organized with multiple spherical views and sectional drawings, capturing the methodical aesthetic of early scientific documentation with authentic aging and texture throughout. 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.