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function setup() {
createCanvas(400, windowHeight);
background(0, 255, 0, 200);
for(let i = 0; i < 500; i++){
let x = random(width);
let y = random(height);
let diameter = random((height-y)/20.0);
fill(255, 255, 255, random(50,220));
ellipse(x, y, diameter, diameter);
}
}