A recent study suggests that what we are capable of perceiving depends on our past experience:
"Music is not only able to affect your mood -- listening to particularly happy or sad music can even change the way we perceive the world, according to researchers from the University of Groningen...
...your brain continuously compares the information that comes in through your eyes with what it expects on the basis of what you know about the world. The final result of this comparison process is what we eventually experience as reality."
Jacob Jolij, Maaike Meurs. Music Alters Visual Perception. PLoS ONE, 2011; 6 (4): e18861 DOI: 10.1371/journal.pone.0018861