This song tells you to be your own person. You decide what you believe, what you see, who you are, etc. People who force their beliefs on you are nothing more than rain coming down on your umbrella. If what someone else believes is considered right (and you disagree), then you would rather be wrong. If what they see is considered sight, you would rather be blind.
There is a lick from Björk's "Possibly Maybe" in the song at a slower tempo.
Suggestion credit: Tim - Pittsburgh, PA, for above 2