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function setup() {
createCanvas(windowWidth, windowHeight);
background(300);
}
let size = 10;
function draw() {
fill(0,0,0);
ellipse(650, 300, size, size);
fill(255,255,255);
ellipse(650,300,size-1000,size-1000);
size=size+10;
if(size === 1000){
size = 10;
}
}