Head for the Glass Factory for this one.
Map
Desert Obelisk
SW #3
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This puzzle involves both doing some solving and finding the perfect place to stand.
There are quite a few unexplained things in the Glass Factory.
The panel by the door raises whichever vase matches the shape you draw. In this case, you want to raise the orange vase, which is very skinny, so you'll draw a very skinny path.
Once you have raised the orange vase, you can head up to the roof and draw the orange path.
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Complete spoiler:
Roll over each black area below for hints.
Each new hint gives away more than the previous one.
That control by the door. Did you notice that something happens when you solve it in different positions?
While you're here in the first room of the Glass Factory, look back toward the rear of the Factory.
Look at the doorway leading to the back of the Factory. Does part of that orange paint look like the curved end of a path?
Is there anything you could use to make the circle at the start of the path? Maybe if you found the perfect viewing angle.
One of those vases is the same orange color as the doorway.
Where would you have to go to line up the orange vase with the orange doorway?
Did you climb on the roof, and find that they still didn't quite line up?
You'll have to figure out what that control by the door does.
Show hints
Intro
This one is really cool. You'll probably be happy if you can find it with minimal hint-taking.
THE WITNESS - ENVIRONMENTAL PUZZLE HINT GUIDE