gistfile1.txt

void setup()
{
  size(500, 500);
  background(255);
  smooth();
 
  translate(0, 20);
  
  for(int i = 20; i > 0; i--)
  {
    float ellipsey = i * 20;
    
    
    // we add 10 to i to make the circles start small on top.
    // then we divide i to make the variation in width a bit smaller
    float varyWidth = cos((i / 3.8f) + 10);
    float ellipseWidth = map(varyWidth, -1, 1, 20, 150);
    
    float varyX = cos(i / 2.5f);
    float ellipsex = (width/2) + map(varyX, 1, -1, -20, 20);
    
    ellipse(ellipsex, ellipsey, ellipseWidth, 10 + (ellipseWidth/10));
  } 
  
}