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var squareSize = 50;
function setup() {
createCanvas(windowWidth, windowHeight);
background(0);
setInterval(drawSquare, 1000);
}
function draw() {
}
function drawSquare() {
rectMode(CENTER);
noFill();
stroke(255);
squareSize = squareSize + 25;
rect(width/2,height/2, squareSize, squareSize);
}