Eight lunar phases progress vertically down the center of a deep black starfield, moving from full illumination through shadow to darkness and back toward brightness. The moons display realistic surface detail and coloring, from silvery white to rust-copper tones, arranged with mathematical precision against a scattered field of white stars. 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.