In class Lab - OpenProcessing

mySketch
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void setup(){
 size (500,500);
 background (0);
 colorMode(HSB);
 noFill();
 frameRate(10);
}
​
void draw(){
  for(int i = 0;  i < 250;  i = i + 50)
  {
    for(int j = 0; j < 250; j = j + 50)
    {
      strokeWeight(random(1,5));
      fill(random(150,160),100,random(200,255));
      rect(i, j,50,50); 
    }
   }
   for(int I = 250; I < 500;  I = I + 50)
  {
    for(int J = 0; J < 250; J = J + 50)
    {
      strokeWeight(random(1,5));
      fill(random(90,100),100,random(200,255));
      rect(I, J,50,50); 
    }
   }
   for(int I = 0; I < 250;  I = I + 50)
  {
    for(int J = 250; J < 500; J = J + 50)
    {
      strokeWeight(random(1,5));
      fill(random(350,360),100,random(200,255));
      rect(I, J,50,50); 
    }
   }
   for(int I = 250; I < 500;  I = I + 50)
  {
    for(int J = 250; J < 500; J = J + 50)
    {
      strokeWeight(random(1,5));
      fill(random(30,40),150,random(200,255));
      rect(I, J,50,50); 
    }
   }
}