semi border

void setup() {

  size(600,400);

  background(100);

  frameRate(2);

}

​

void draw() {

  int ran = int(random(255));

  fill(0,0,ran);//blue

  manyRects(15,0,50,50);//call to the function

  fill(255,0,0);//red

  manyRects(50,100,50,50);

  fill(0,255,0);//green

  manyRects(15,350,50,50);

}

​

void manyRects(int num, int y,int myWidth, int myHeight){//signature of the function

 for(int i=0;i<num;i++){

     rect(50*i,y,myWidth,myHeight);

 }

​

}