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A Definition of the Word "Disposition"
Thanks to dictionary.com:
2. state of mind regarding something; inclination
Could it be that this song merely creates a certain mood that you want to associate with the piece?
Like it has been suggested many times before, this is a way for you to relax and try your imagination, as well as ponder "Lateralus", after being hit with such a powerful wall of emotions and meaningfulness.
In philosophy, physiology, and psychology, a disposition is a habit, a preparation, a state of readiness, or a tendency to act in a specified way.
I also found some other meanings to the word, but essentially any defination of the word, you can find a way to connect the song to something close or meaningful to yourself. I personally like the "state of readiness" defination.