float x0 = 50;
float y0 =50;
float z0 =0;
float h =0.001;
float a = 10.0;
float b=28.0;
float c=8.0/3.0;
float time=0;
void setup() {
  size(500,500);
  background(0);
   smooth();
   frameRate=200;
}
void draw() { 
  time++;
  fill(0, 0.5);
 rect(0,0,width,height);
for(int n=0; n<20; n=n+1) {
  float x1 = x0+h*a*(y0-x0);
  float y1 = y0+h*(x0*(b-z0)-y0);
  float z1 = z0+h*(x0*y0-c*z0);
  noStroke();

  fill(255,z0);
  ellipse(250+x0*10, 250+y0*10, 100/z0, 100/z0);

  x0=x1;
  y0=y1;
  z0=z1;
 
}
}