A Zen teaching riddle. Classically,
koans are attractive paradoxes to be meditated on; their purpose is
to help one to enlightenment by temporarily jamming normal
cognitive processing so that something more interesting can happen
(this practice is associated with Rinzei Zen Buddhism). Hackers are
very fond of the koan form and compose their own koans for
humororous and/or enlightening effect. See Some AI Koans,
has the X nature, hacker humor.