This image shows a more complex target. It's made of the same patterned retroreflective material as the triangle targets (also tilted at 45 degrees) placed behind a transparency with the sailboat image laser-printed on it. The target, about 1 centimeter tall, is larger than the diffraction-limited illuminating spot size (shown schematically at right). Thus, the image was formed by scanning the laser spot in five strips across the target and tiling the results (only three strips were used in this example.) The image quality is somewhat degraded (note the streaks at the top of the sails) because of the transparency (which can be viewed as a crude "phase-screen" between the target and the transceiver); nonetheless, the pattern of the retroreflective material is clearly visible, as is the wavy water below the sails.