It cannot be a natural shadow, so what can it be??
Should be fairly easy to replicate in about one month!
Well there's no need actually, Mr Beck
-----------------we know the sun's angle to the entranceway at 12.30pm 11/22/63, we know the dimensions of the entranceway, and smarter people than me have done the 3D reconstructions.
Result? Not a natural shadow! As in: completely out of the question.
Mystery of the dark strip down Mr Lovelady's side? Unsolved!