Rule
#15: We only know through perception.
Cogito ergo sum is a bit of a no-brainer to include when describing
paradigms of human existence, but its a good one. Even deduced
information is drawn from data gathered through ordinary perception.
If
Rule 14 is the “what you see is what you get; deal with it,” of
existence, Rule 15 is the rider that says, “yeah, but you might
just be a brain in a jar.”