In the seminars on Exo-Psychology which I teach these days, I dramatize this point by having the entire class visualize the hall they came through in entering the seminar room. Then I ask how many people visualize five distinct items, ten, fifteen . . . When we find the person with the largest number of distinct signals in memory storage, we list the elements of that person’s hall on the blackboard. We call this number X. Then we collect all the signals from the rest of the class that were not on the list, X. The new list is always higher than 2X. That is, if the memory champ of that class
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