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function setup() {
createCanvas(windowWidth, windowHeight);
stroke(0);
fill(0, 127, 255, 127);
background(0);
let x = 0;
let y = 0;
let w = width/2;
let h = height/2;
for (let i = 0; i < 32; i++) {
rect(x, y, w, h);
rect(x + w, y + h, w, h);
w = w / 2;
h = h / 2;
}
}