(vfrac .(gradient ..(red-from-hsl ...(gradient ....(length .....(blue-from-hsl ......(offset .......(hue-from-rgb ........(length .........(blue-from-hsl ..........(offset ...........(hue-from-rgb ............(vdivide [-1.6036 -1.3652 -1.5211] [-0.8197 2.2178 -1.8565])) ...........(v+ pos pos))))) .......(v+ pos pos))))))))