Unfathomable: Brain or Universe

The nature of man (homo sapiens sapiens) to give structure and sense to all things around him, has made him question and understand the universe for eons. Though much has been unravelled and understood, the rabbit hole has just kept getting deeper. We still don't know how much we don't know. We don't know for certain about the starting of the universe, its evolution, or its end. We don't know whether there are life forms (as we know it), anywhere else apart from the blue planet. We don't even know whether the other species on this planet have attempted to answer these questions and whether we can ever learn something from them, since they have been around longer. The complexity of the Universe is unquestionable and even difficult to percieve.

Our ability to question, think and understand the processes around us depends on our brain. The Brain makes us see that the sky is blue, makes us think that there might be life in outer space, that happiness and sadness are two different emotions. It allows one to dream, hallucinate, believe, cry, smile, write, read, .....the brain makes us believe we have a brain and its the most important organ (too recursive?). Isn't it the Brain that gives us a perception of a Universe in the first place? There are 6.5 billion people in this world and 6.5 billion universes that their brains have created for them ?. The Brain and its functioning remain as much shrouded in mystery as the Universe itself.

Though it is difficult to consider the brain as a separate system outside of the Universe, how do we then resolve the issue that the Universe is, as seen by the Brain? If we consider them as two different systems, then which one is more complex? Can a less complex system fully understand the workings of a far more complex system? Can a subsystem understand the whole? Is the Brain a subsystem of the Universe or vice versa? Is the Universe more complex than the Brain or vice versa?