It`s a well
There are some things I find a bit odd: - The wooden beam throws a shadow to the front, though the well shaft does not (as there is no floor to cast it on) - The front side of the well shaft seem highly reflective, to me it looks like the stone was sprayed over with some silver - The size of the bricks that make up the top rim do not match the well shaft. - The main light should come from somewhere behind the camera.
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it's a well done well!