In Blade Runner 2049, the tree, where Officer obtains the chest of bones, is tied to the ground.
Why is the tree tied to the ground?
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That tree, along with most animals in the world of Blade Runner is dead and it's tied to the ground to prevent it from falling.
It's most likely an attempt by Sapper Morton to make it feel like a real farm by having a natural element which used to be pretty common in the old world.