A cross-section of an agate geode reveals concentric bands of turquoise, teal, and deep blue radiating from a luminous crystalline core. The layered rings create a hypnotic symmetry, with the outer edges transitioning to pale aquamarine and white, suggesting the slow geological time that formed this natural wonder. 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.