Movement is life and stillness is death; for in movement there is the significance of life and in stillness we see the sign of death. One might ask if looking at it from a metaphysical point of view there is a stillness. No, but there is what we call no movement, or at least no movement which is perceptible to us in some form, whether it is visible or audible or in the form of sensation or vibration. The movement which is not perceptible to us we name "stillness"; the word "life" we use only in connection with the perceptible existence, the movement of which we perceive.