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function setup() {
createCanvas(windowWidth, windowHeight);
}
function draw() {
background(50,50,100,25);
stroke(100,100,255,random(255));
noFill();
arc(random(1000),random(1000),50,50,0,HALF_PI);
arc(random(1000),random(1000),50,50,0,HALF_PI);
arc(random(1000),random(1000),50,50,0,HALF_PI);
arc(random(1000),random(1000),50,50,0,HALF_PI);
if(mouseIsPressed){
stroke(255,255,255,random(255));
strokeWeight(random(5));
translate(mouseX,mouseY);
ellipse(0,0,random(500));
}
}