(checker .(average [2.3563 2.1392] ..(vconcat ...(vround ....(lightness-from-rgb .....(height-normal ......(rgb-from-hsl .......(average pos pos))))) ...(vmax pos ....(hue-from-rgb pos)))) .(vsin ..(sigmoid ...(green-from-hsl ....(vmod -0.5841 .....(vdivide ......(square .......(rgb-from-hsl pos)) ......(vsqrt .......(normalize ........(cross3 [-0.2348 -1.5715 2.3844] [1.6503 2.3452 0.4189 1.3627])))))))))