Move the mouse to position the shape. Press the mouse button to invert the color. 

def setup():
    size(640, 360)
    noSmooth()
    fill(126)
    background(102)


def draw():
    if mousePressed:
        stroke(255)
    else:
        stroke(0)
    line(mouseX - 66, mouseY, mouseX + 66, mouseY)
    line(mouseX, mouseY - 66, mouseX, mouseY + 66)