The idea presented in this film  is quite bizarre and hard to absorb.  A mathematician is convinced of the existence of an integer between 3 and 4 and somehow this is linked to higher dimensions at work in this world.  The flashback scenes lead us to believe that the boy who witnessed the accident was the psychiatrist himself.  There are confusing scenes that are hard to grasp but  on one side,  this presents a unique facet of the human mind.   Do check out this flick if you're fond of  mind-boggling flicks.