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float counter = 0;
void setup()
{
size(400, 400);
}
void draw()
{
background(150);
translate(width/2, 300);
pushMatrix();
translate(0, sin(counter)*100);
ellipse(0, 0, 320, 160);
noStroke();
fill(85,47,9);
popMatrix();
counter += 0.001;
}