draw nice interference patterns between folded sheets

//lissajous1
//alphachapmtl
//2007-aug-17

int n=800;//image size
int margin=8;
float n2,n4;

void setup() {
 int nn=n-2*margin;
 n2=nn/2.00;
 n4=nn/4.00;
 int maxWidth=n;
 int maxHeight=n;
 size(n,n);
 background(0);
 noFill();
 ellipseMode(CENTER);
 noLoop();
}

void draw() {
 int r,g,b,a;
 float x,y,w,h;
 //initial color
 r=0;
 g=100;
 b=200;
 a=30;
 for (int t = 0; t < 2000; t++) {
   float tt=t*TWO_PI/500;
   //change color
   r=(r+10)%255;
   g=(g+15)%255;
   b=(b+20)%255;
   //a=(a+2)%50;
   stroke(r,g,b,a);
   //set center x,y
   x=margin+n4+n4*(1+sin(1.0*tt));//change the 1.0, the sin(), ...
   y=margin+n4+n4*(1+cos(2.0*tt));//change the 2.0, the cos(), ...
   //set width,height
   w=n2*sin(3.0*tt);//change the 3.0, the sin(), ...
   h=n2*cos(2.0*tt);//change the 2.0, the cos(), ...
   //draw ellipse
   ellipse(x, y, w, h);
 }//for
}

/*try those:
x=margin+n4+n4*(1+sin(2.0*tt));
y=margin+n4+n4*(1+sin(cos(1.0*tt)));
w=n2*sin(2.0*tt);
h=n2*sin(cos(3.0*tt));
or those:
x=margin+n4+n4*(1+sin(1.0*tt));
y=margin+n4+n4*(1+cos(1.5*tt));
w=n2*sin(2.0*tt);
h=n2*sin(cos(1.5*tt));
*/

LOL

nice one