Practice Drawing - OpenProcessing

mySketch
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/*-----------------------------
Practice Drawing 
​
Created 7 Feb 2017
By Tamara Sabbagh
tamara.sabbagh@gmail.com
​
https://www.openprocessing.org/sketch/404673
-----------------------------*/
​
void setup() {
  size (500, 500);
​
}
void draw() {
​
  frameRate(5);
​
float R = map(mouseY, 0, height, 100 , 450);
​
background(R, 0, 150);
​
  for (int i = 25; i <200; i = i+30) {
    for (int j = 25; j <200; j = j+30) {
      fill(255, random(0, 238), 66, random(90, 100));
      ellipse(i, j, 25, 25);
    }
  }
  for (int i = 225; i <500; i = i +30) {
    for (int j = 25; j<200; j = j+30) {
 fill(random(200,255), random(200,255), random(200,255),90);
      ellipse(i, j, 25, 25);
    }
  }
​
  for (int i = 25; i <200; i = i +30) {
    for (int j = 225; j<500; j = j+30) {
      fill(random(200,255), random(200,255), random(200,255),90);
      ellipse(i, j, 25, 25);
    }
  }
​
  for (int i = 225; i <500; i = i +30) {
    for (int j = 225; j<500; j = j+30) {
      fill(255, random(0, 238), 66, random(90, 100));
      ellipse(i, j, 25, 25);
    }
  }
}