The lens flare in this photo was a happy accident (as are so many of my better pictures). It was shot on a hot, cloudless summer day. As you can see, the camera was pretty high relative to the leg of the Arch. It was taken from Eads Bridge, a good ways up from ground level at the foot of the monument, on the same day as this post on Gateway from November 15. The Arch doesn't look tethered to the earth.