processing.pde

void setup()
{
  size(600, 800);
  background(22, 117, 200);
  noStroke();

  int numCircles = 3;
  int y = 0;

  while (y < height)
  {
    pushMatrix();
    
    float circleDiameter = (float) width/ (float) numCircles;
    translate(circleDiameter/2, 0);

    for (int i = 0; i < numCircles; i++)
    {
      arc(i * circleDiameter, y, circleDiameter, circleDiameter, 0, PI);
    }
    
    numCircles++;
    y += circleDiameter/2;
    
    popMatrix();
  }
}