Permutations & Combinations

mySketch
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function setup() {
  createCanvas(600, 600);
  colorMode(HSB,400);
  frameRate(10);
}
​
function draw() {
  background(0);
  
  stroke(0,0,400,200)
  strokeWeight(20)
  noFill()
  
  for(var j=0; j<600; j=j+50){
    for(var i=0; i<600; i=i+50) {
      if(random(2)>1){
        arc(50+i, j, 50,50, HALF_PI, PI, OPEN)
        arc(i, 50+j, 50,50, PI+HALF_PI, 0, OPEN)
      }
      else{
        arc(i, j, 50,50,0, HALF_PI, OPEN)
        arc(50 + i, 50 +j,50,50,PI,PI+HALF_PI,OPEN)
      }
    }
  }
  
}