Mike is hanging a picture on the wall. He places a bubble level on top of the picture frame to make sure it is level. At first, the left side of the frame is higher, so the bubble in the bubble level shifts to the left. He then adjusts the frame, but overcorrects, causing the bubble to shift to the right. He makes a slight adjustment, but it is not enough, the right side is still higher. He adjusts the frame once more, and finally gets the picture perfectly level.