(z .(average ..(vsin ...(length ....(turbulate .....(rgb-from-hsl ......(polar .......(hue-from-rgb [2.0597 -2.9794 -1.1966]))) .....(polar ......(normalize .......(height-normal pos)))))) ..(y ...(checker grain ....(green-from-hsl .....(vpow ......(theta .......(gradient [-1.3891 1.9594 -1.3756 -2.4784])) ......(vcos .......(theta pos))))))))