20 lines of code #12

function setup() {
colorMode(HSL);
randomSeed(fxrand()9999999999999);
noStroke();
createCanvas(min(windowWidth, windowHeight), min(windowWidth, windowHeight));
let u=width/(random(50,300));
let h = random(0,360);
let n = random(0.62,0.98);
let a = random();
for (let y=-height1.2;y<height;y+=urandom()) {
for (let x=-width1.2;x<width;x+=urandom()) {
let s = random()<n ? abs(abs((map(x,0,width,-100,100)))-100) : random(0,100);
let l = random()<n ? map(y,0,height,90,10) : map(y,0,height,20,90);
fill(color(h,s,l,random(a,1)));
let newy = random()<n ? y : y-urandom(1,5);
rect(x,newy,u*random(1,5),height);
}
}
fxpreview();
}