(vfrac .(checker ..(vpow ...(vpow ....(adjust-hue [2.4212 2.1765 1.2378 -2.0141] .....(normalize ......(alpha .......(rgb-from-hsl ........(normalize [1.6224 -2.9024 2.5981]))))) wood) ...(hue-from-rgb [0.6832 2.7459])) ..(height-normal agate)))