Have you ever thought how vulnerable we are and how uncertain our world is? Tempus edax rerum. Time, devourer of all things. This Latin saying perfectly illustrates the fate of any physical object, any civilization, including the Roman Empire. Decay is one of the major forces that assist time in its pursuit of destruction. Microorganisms eat away both organic and inorganic matter, both natural and man-made textures. Uncertainty is the only certainty. Impermanence is the only permanence.