The absolute zero of temperature is only a point of zero energy in classical physics, which is only an approximation of reality.
In quantum physics it is the point of lowest system energy, which is never zero.
[The simplest, but not always the most correct way to see this is that by the Uncertainty Principle, the ground state of every quantum system that has finite spatial extent (which, for example, descibes anything in our universe) has some non-zero momentum. So "all" motion cannot cease, even at absolute zero.]
If Helen Keller fell down in the woods and no one was around to hear it, would she make a sound?