"Right brain" and "left brain" are a bit more of a metaphor than anything else, but you can think of your thinking activities as "modal" in a way. The left/linear thought and the right/rich thought are both important, and they need to work together, but you can't push both at the same time. The metaphor I really like (from Andy Hunt's great book, "Pragmatic Thinking") is that you have two CPUs (R and L), and one shared bus. 
I call it a metaphor because physically, you have just one "brain" and we don't REALLY understand how it works. however, in terms of those metaphors, the R CPU thinks in terms of symbols, while the L CPU works in terms of words. It serializes the R stuff.
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