Top-down visual processing

My area of study is Visual Communications. I'm interested in designing logos or posters. I chose this picture because it reminded me of some logos I've seen before (minus some text in the center), but it also relates to the topic of Top-Down Visual Processing. The image appears to have a white square on top of 4 black circles. What we really are seeing is 4 black circles with 1/4 of it cut out. Our brain make us think we are seeing a square. As it was stated in the Ware Reading, "Top-down processes are driven by the need to accomplish some goal." Our brains are biased and "what we see is the result of information about the world strongly biased according to what we are attempting to accomplish."

image from:
http://www.dana.org/uploadedImages/Images/Content_Images/art_0607hood_3.jpg