A great photograph is a photograph which when you saw it first you don't get interested; but after looking and staring at it, enjoying it, and something in your heart moving, then it's a timeless picture, because it was made from your heart, not only from your eyes and brain...:)
This picture is great because of the moment and different orientation of the people, the neat pattern in the background and the paving, and also the contrast and depth. That's my point of view..:)
Thanks, big man. At first, this image seemed unremarkable to me, but after staring at it for a while and turning it into b/w, it took on a more mysterious dimension.