This research examines the relationship between mathematics, cosmology and architecture. Throughout the years, architectural evolution is related with geometry, a mathematical branch that if it had not discovered, architects should have been invented it. Concerning, cosmology, it is important to remember that the space created by man is a limit to its own space with the outer space - world. The man during the years strives to explain how this cosmos interacts, so that he can become familiar with it and create his own.
But how these three fields together are connected? The answer lies in the visual perception of the individual and the aesthetics. The art of architecture is constantly concerned with the issue of aesthetics and how it perceives from the observers .The way we see the world, the reality that is hidden and we can’t see with naked eye, is a kind of truth that satisfies the viewer and It offers a general well - being. Modern neurobiology has quantitatively demonstrated that the orbitofrontal cortex is activated when we have some aesthetic experience .Such characteristics are the simplicity, symmetry and truth. Aesthetics therefore, is an expression of simplicity and elegance of global truth. From Pythagoras to modern astrophysicist, man shall seek the universe and morphological attributes through geometry. Architecture as a social language, from the pre-classical civilization until today, trains viewers to new ways of perception, using the language of geometry.