What is the purpose of a bubble level on an archery sight?

What is the purpose of a bubble level on an archery sight? I see many archers have them attached to their bow sights at local 3-D competitions.

Answer:
Try this experiment, and see for yourself. The next time you are on level ground at the practice range, try hitting the bull’s-eye while canting your bow. You will notice that your arrows will fly well off their mark. A similar result occurs when bowhunting from uneven terrain. We think we are shooting from a level platform when in reality we are canting the bow downhill. To compensate, some archers use a bubble level while others consciously cant their bow INTO the hill to make the shot.

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