"Knowledge is the perception of the connection and agreement, or disagreement or repugnancy, of any of our ideas."
--John Locke, An Essay Concerning Human Understanding
"Perhaps the most important thing in connection to aesthetics is what might be called aesthetic reactions, e.g. discontent, disgust, discomfort. The expression of discontent is not the same as the expression of discomfort. The expression of discomfort says: 'Make it higher . . . too low! . . . Do something to this.'"
--Ludwig Wittgenstein, notes on architecture made during the construction of the family home in Vienna.