Introduces chromatophore cells into the nail beds of fingers and toes, allowing voluntary color-shifting of the nails across the full visible spectrum. The nails can display solid colors, gradients, patterns, and even simple animated effects. Combined with structural coloration from morpho butterfly genes, the nails produce iridescent, holographic-quality color effects that no nail polish can replicate. The modification has completely replaced the nail polish industry in GLMZ. Nail salons now offer chromatophore pattern programming rather than paint application. Animated nail displays synchronized with music or conversation are considered high art. The modification is inexpensive, painless, and nearly universal — it's difficult to find someone in GLMZ under age 50 with unmodified nails.