def setup():
    size(500, 500)
    stroke(50, 50, 250)
    fill(150, 150, 250)
    rectMode(CENTER)

    global x, y, c
    x = []
    y = []
    c = []

def draw():
    background(255)

    i = 0
    while i <= len(x)-1:
        fill( c[i] )
        rect(x[i], y[i], 25, 25)
        x[i] = x[i] + random(-5,5)
        y[i] = y[i] + random(-5,5)
        i = i + 1

def mousePressed():
    x.append(200)
    y.append(200)
    r = random(0,255)
    g = random(0,255)
    b = random(0,255)
    c.append( color(r,g,b) )
    print( len(x) )