A systematic gradient chart displays two vertical columns of color scales transitioning from deep black through jewel-toned purples, magentas, and pinks on the left, to earthy olive-greens, golds, and pale yellows on the right. This nineteenth-century scientific illustration exemplifies the methodical study of color relationships, rendered with precise horizontal bands that shift incrementally in tone and saturation across the composition. Printed to order on a soft, absorbent mat with a no-slip backing, ready underfoot the moment you step out. The kind of art you don't expect on a bathroom floor.