(sigmoid 
.(scale 
..(sigmoid 
...(vdivide 
....(vfrac 
.....(x 
......(vcos [-0.691 2.7014]))) 
....(vconcat 
.....(hue-from-rgb 
......(scale 
.......(max-component [-1.2309 2.9606 0.6761 -0.7265]) 
.......(sigmoid 
........(vdivide 1.0962 pos)))) 
.....(average 
......(vsqrt 
.......(rotate 
........(min-component [0.0944 1.9846]) 
........(alpha [-2.3798 -1.7159 -1.2828]))) 
......(z 
.......(vmax 
........(cross3 [2.7964 -0.3777 1.0132] [2.2156 0.0683 -2.2824]) 
........(vcos pos))))))) 
..(hsl-from-rgb 
...(adjust-hsl grain 
....(vsin 
.....(y 
......(vconcat 
.......(max-component 
........(lightness-from-rgb [-1.6633 0.8729 -2.3288])) 
.......(z [0.3419 2.1245]))))))))