You worked at this image, it is not a photo taken, it is an image made. Do you know that when you place a circular object into a perfectly square format the image strengthens and the reason is because the natural pathway of our (western) eye is to read around and with the sides being equidistant from each other the eye bounces off the sides and back into the circle. Try it for fun and you will see what I mean. Y'see with a rectangle it is natural for the eye to read along the longest line, we read from left to right and then out of the frame. You want to keep our eyes inside of your photograph for as long as possible. I like the concept of round cork tops in a round circle.