You must use the small lift.
It is found indoors.
Map
Quarry Obelisk
NW #4
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It is in the factory in the quarry.
It involves light and shadow.
How do we join the start and end points?
Lower the lift first, then raise it, and as it raises, stand on the catwalk on the opposite side of the factory. Start drawing the shape and as the light on the lift meets your line, get on the lift with your cursor. Finish at the top.
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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
The shape is formed from light and outlined by shadow.
The start and end points should be very obvious.
This is a fun one.
It will never form a full line all at once.
This requires manipulation of other objects.
Show hints
THE WITNESS - ENVIRONMENTAL PUZZLE HINT GUIDE