There is currently a TV series here in the U.S. called "Brain Games" on the National Geographic Channel. It demonstrates some interesting details of how our brains appear to work. The show has taught me to think about what is actually going on in my brain (which I consider separate and somewhat independent from my mind). One thing I have found remarkable is how much our brains "fill in the blanks." Having some knowledge about when and how that may happen, I've learned to recognize some cases when my brain has filled in what is not there. What happened in this case was that the instant I saw the image, I imagined a door in the shadows to the right of the statue. The door would have been out of focus and a distraction had it been included. In the past, I would have just dismissed it without thinking about it or even recognizing that my brain invented the door, but now I have some inkling of what is happening, and I find it interesting. In this particular case, I believe most of us have that instant reaction or something like it.
BTW, before taking on some of this understanding, a year from now, if you had asked me to draw this photo, my brain might have tricked me into including the whole arch and the door, plus I might have drawn the whole sculpture, including his bare feet. (How do I know his feet are bare? My brain invented that, too, without consulting me.) Confronted with the actual image, I would have struggled to reconcile the two. A classic example of the problem with eyewitness testimony.
Tom