Many different answers have been offered in response to the inquiry, "Why/how does time exist (if it exists at all), and how could its existence possibly be proven?" One of my favorite responses was that of Immanuel Kant, who, being the philosophical juggernaut that he was, elegantly sidestepped the question by suggesting that the human capacity for experiencing events bounded by such elementary perceptual conditions as 'time,' 'space,' and 'causation' actually constituted the necessary (but not sufficient) precondition for all meaningful thought and coherent (i.e., non-delirious) observation. Presto! The issue of whether such things as 'causation' and 'time' exist, was, according to Kant, simply not up for coherent metaphysical discussion, as such things lay outside our purview as sentient, rational beings capable only of discerning certain patterns inherent in the phenomena (an emotion, a keyboard, the temperature of a liquid) that we can directly perceive/experience, as opposed to the noumena (e.g., infinity) that we cannot.