This only requires having the right perspective.
Map
Quarry Obelisk
NW #3
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It's on the ground.
It's in the quarry.
It's viewed from above.
Stand on the roof of the factory in the quarry and look towards the laser box. Look down at the area with free-standing walls. The shapes is formed by the circular pile of marble and bordered by the walls and shadows.
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Complete spoiler:
Roll over each black area below for hints.
Each new hint gives away more than the previous one.
Intro
Did you find any suspiciously circular shapes?
Shadows are involved.
This one is purely visual.
Where are there high vantage points in the quarry?
Show hints
THE WITNESS - ENVIRONMENTAL PUZZLE HINT GUIDE