Question

Why do you need to change the order of layers in a movie?
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Answer 1

Answer:

In addi- tion, by rearranging your layers, you can easily rearrange the order of your objects — that is, which objects appear to be on top and which appear to be on the bottom. Layers are also necessary for error-free animation. ... Layers provide a great way to keep the various components of your movie organized.

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Answer 2

Objects that are on higher layers appear to be in front of objects on lower layers. you can change the order of layers . You want to place the sky behind the building.