This is why I hate orb pics, and usually skip right past them. 9 times out of 10...take it back 10 times out of 10 it is either dust, light reflections, or in this case a spotlight.
im not so sure its a spot light. its deffo infront of the walk way what ever it is, if you look close there is a pipe joined to the underside of the walk way that runs all the way along but you can not see the pipe where the "orb" is as it obscures it and must be infront.
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