The Cosmic Uroborus, showing the hierarchy of scales of structure in the Universe, from the Planck scale of quantum gravitational effects at 10−33 cm to the scale of the observable Universe at 10+27 cm. One can regard this as a clock, with the size increasing by a factor of ten for each minute. The structures on the left and right are in the domain of relativity theory and quantum theory respectively, and these theories must be unified at the top. Mind and extra dimensions may play a role here.
