My problem is that I have been persecuted by an integer. For seven
years this number has followed me around, has intruded in my most
private data, and has assaulted me from the pages of our most public
journals. This number assumes a variety of disguises, being sometimes
a little larger and sometimes a little smaller than usual, but never
changing so much as to be unrecognizable.
-- George A. Miller "The Magical Number Seven, Plus or Minus Two: Some
Limits on Our Capacity for Processing Information" The Psychological
Review, 1956, vol. 63, pp. 81-97. (p. 81)
http://www.psych.utoronto.ca/users/peterson/psy430s2001/Miller%20GA%20Magical%20Seven%20Psych%20Review%201955.pdf