 Since our ability to appreciate the significance of phenomena is so easily dulled, it requires a certain discipline in order to become and remain a reliable knower of the world. Like Aristotle, Thoreau believes that the perception of truth “produces a pleasurable sensation”; and he adds that a “healthy and refined nature would always derive pleasure from the landscape” (Journal, 9/24/54 &amp; 6/27/52). Nature will reward the most careful attention paid by a person who is appropriately disposed, but there is only “as much beauty visible to us in the landscape as we are prepared to appreciate,—not a grain more. The actual objects which one person will see from a particular hilltop are just as different from those which another will see as the persons are different” (Journal, 11/4/58). One who is in the right state to be capable of giving a “poetic and lively description” of things will find himself “in a living and beautiful world” (Journal, 10/13/60 &amp; 12/31/59). Beauty, like color, does not lie only in the eye of the beholder: flowers, for example, are indeed beautiful and brightly colored. Nevertheless, beauty—and color, for that matter—can exist only where there is a beholder to perceive it (Journal, 6/15/52 &amp; 1/21/38). From his experience in the field making observations of natural phenomena, Thoreau gained the insight “that he, the supposedly neutral observer, was always and unavoidably in the center of the observation” (McGregor 1997, 113). Because all perception of objects has a subjective aspect, the world can be defined as a sphere centered around each conscious perceiver: wherever we are located, “the universe is built around us, and we are central still” (Journal, 8/24/41). This does not mean that we are trapped inside of our own consciousness; rather, the point is that it is only through the lens of our own subjectivity that we have access to the external world.