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originally posted by: Zarniwoop
Not a tree, or any other upright object, it appears.
originally posted by: humanoidlord
optical illusion, its an striation in the background rock
I don't know what that means but the shadow would not be where your arrow is pointing.
originally posted by: ausername
In the full image if you zoom in on the object then scroll up through the rocks slightly to the left you'll find similar lines.