"...when it comes to real-world understanding, it seems that there is no simple way to skim off the top level, and program it alone. The triggering patterns of symbols are just too complex. There must be several levels through which thoughts may 'percolate' and 'bubble'."

Hofstadter, Douglass R. Godel, Escher, Bach: an Eternal Braid. New York: Basic Books, 1999. Print. p. 569