I could see this picture in my mind’s eye but getting it meant holding my camera above my head, against the wall and ‘guesstimating’ the right angle.   Other tourists were watching me and I could see they were intrigued about what I was doing as they couldn’t see what I was trying to do.  (I had to hold the camera against the wall to give some solidity and prevent camera shake as the exposure was down to 1.6 seconds).