It is situated in the town area.
Look around the sides of the orange structure.
It involves the building with boarded-up windows and an orange second-floor structure.
Locate the building in the town that has boarded-up windows and an orange second-floor structure with colorful foliage on one side.
Ignore the obvious red start circle (that's a different puzzle) and peek around the right corner to locate the green start circle.
Make sure the interior lighting is green-colored so that the green light shining out of the windows will match with the green foliage on the outside.
To change the color of the interior light, you must go upstairs and use the center panel puzzle. And to access those stairs, you have to have solved the puzzle in the basement.
The orientation of the enclosure containing the tromino (3-block tetris shape) will determine the interior lighting color.
Once the lighting is correct, go outside and solve this puzzle from ground level.
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Complete spoiler:
Notice the colorful foliage on one side.
It's not the obvious red start circle. That's a different environmental puzzle. :)
It is not underground.
The reason one of the prerequisites is cool is because it gives purpose to something that previously seemed to have no purpose.
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Roll over each black area below for hints.
Each new hint gives away more than the previous one.
Try peeking around the corner.
Look closely at the parts of the path that are not green. Is that because of foliage or because of something else?
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Hmm...it could be light.
Light from the interior...
If only there were a way to change the interior light color... :)
Go inside the building and walk up the stairs. If you can't get upstairs yet, then you still have to satisfy another part of the prerequisite.
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Map
Town Obelisk
NE #6
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Intro
This one is visual and is fun because it has a cool prerequisite. (Actually, a couple prerequisites.)
On the second floor, play around with the center panel puzzle.
There are different solutions to that panel that change the color of the lighting. See if you can get it to be green.
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The different colors are activated depending on how you orient the enclosure that contains the tromino (3-block tetris shape).
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Once you have activated the green light, go outside and solve the puzzle from ground level.
The prerequisites involve having solved a couple puzzles in town.
Once you locate the green start circle, does the path from right to left appear to be entirely green? If so, great. If not, then you have to satisfy the prerequisite.
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THE WITNESS - ENVIRONMENTAL PUZZLE HINT GUIDE