This sketch is created with an older version of Processing,
and doesn't work on browsers anymore.
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float r = 0;
void setup() {
size(500, 500);
stroke(255);
noFill();
frameRate(18);
}
void draw() {
background(0);
translate(width/2, height/2);
for (int i=0; i<20; i++) {
rotate(r);
scale(sin(r));
ellipse(0, 0, 100, 50);
}
r += 0.05f;
}