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function setup() {
createCanvas(400, 400);
}
function draw() {
let brightness = map(mouseX, 0, width, 0, 255);
let r = map(mouseX, 0, width, 0, 255);
let g = map(mouseY, 0, height, 0, 255);
let b = map(mouseY, 0, height, 0, 255);
background(brightness);
rectMode(CENTER);
//fill(255-brightness);
fill(r, g, b);
rect(width/1.5,height/1.5,100, 100);
rect(width/2,height/2,100, 100);
rect(width/6,height/6,100, 100);
rect(width/5,height/5,100, 100);
}