(rgb-from-hsl 
.(square 
..(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]) [-1.035 0.3685])))))) 
...(height-normal 
....(offset 
.....(z 
......(radius 
.......(adjust-hsl 
........(sigmoid [-2.4579 1.6986 2.5909]) pos))) wood)))))