This puzzle requires lining objects up.

It starts on the roof of a building.

You must stand in the adjacent ‘shadow’ forest.

And some pieces of metal that line up with this?

There is a dark grey circle on the Quarry, which seems very like the start of a puzzle. The tricky part is backing way up into the Shadow forest and finding the spot where some grey metal pieces there form a short path with the circle.

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Look towards the Quarry.

Do you see a round object on the Quarry Building?

You need to line the puzzle up.