(rgb-from-hsl 
.(square 
..(vmod 
...(height-normal 
....(average 
.....(z 
......(radius 
.......(adjust-hsl [-1.035 0.3685] pos))) 
.....(checker 
......(sigmoid [-2.4579 1.6986 2.5909]) wood))) 
...(average 
....(z 
.....(hsl-from-rgb 
......(vmod 
.......(blue-from-hsl 
........(v+ 
.........(vfloor [3.7318577870732668 -4.086477081749095]) 
.........(vmod 
..........(blue-from-hsl 
...........(z 
............(v+ 
.............(vfloor [3.7318577870732668 -4.086477081749095]) 
.............(v- 
..............(vfloor pos) 
..............(radius pos))))) 
..........(height-normal 
...........(average 
............(z 
.............(radius 
..............(adjust-hsl [-1.035 0.3685] pos))) 
............(checker 
.............(sigmoid [-2.4579 1.6986 2.5909]) wood)))))) 
.......(height-normal 
........(offset 
.........(z 
..........(radius 
...........(adjust-hsl 
............(sigmoid [-2.4579 1.6986 2.5909]) pos))) wood))))) 
....(checker 
.....(sigmoid [-2.4579 1.6986 2.5909]) wood)))))