So, while they can't be stationary, these sharks can fall into a sleeplike state while keeping their mouths open to catch water — and their eyelids open to monitor the movement of creatures around them.
And there's no experiment that you could do that can tell the difference between an elevator in space moving upwards at 9.8 meters per second per second and an elevator sitting still on the surface of the earth.
Aristotle claimed that the planets were perfect spheres and moved around the earth in a circular motion and at a constant speed while the earth remained still.
They all looked so strange standing there perfectly life-like and also perfectly still, in the bright cold moonlight, that it was eerie work crossing the courtyard.