There is a gleam of ultramarine,--which, most of all tints, say the painters, possesses the quality of light in itself,--banished to the farthest horizon of the ocean, where it lies all day, a line of infinite richness, not to be drawn by Apelles, and in its compression of expanse--leagues of sloping sea and summer calm being written in that single line--suggestive of more depth than plummet or diver can ever reach. Such an enchantment of color deepens the farther and interior horizon with most men,--whether it is the atmosphere of one's own identity still warming and enriching it, or whether the orbed course of time has dropped the earthy part away, and left only the sunbeams falling there. But Leonardo da Vinci supposed that the sky owed its blue to the darkness of vast space behind the white lens of sunlit air; and perhaps where the sea presents through the extent of its depth, as it slips over into other hemispheres, tangents with the illumined atmosphere beyond, it affords a finer filter for these blue rays, and thenceforth hoards in its heart the wealth and beauty of tint found in that line of ultramarine. Thus too, perhaps, in the eyes of these fortunate men, every year of their deepening past presents only a purer strain for such sunshine as is theirs, until it becomes indeed "The light that never was, on sea or land." The child's conjecture of the future is one of some great, bright, busy thing beyond the hills or over the river. But the thought is not definite: having nothing to remember, he has nothing by which to model his idea. The man looks back at the past in much the same manner, to be sure,--always with something between,--if not the river or the hills, at least a breath of mist out of which rises the vision he invokes; but the vision has a shape, precise and clear. If it is sadness that he seeks, sadness comes, dark as the nun of the Penseroso, without a glimmer of the countless and daily trifles of fairer aspect that made her actual presence possible to suffer,--comes to flatter his memory with assurance of strength in having endured so much and yet survived, or to stab him with her phantom poniards freshly and fiercely as ever,--no diffused affair, but a positive shape of melancholy. But if the phase to be recalled is of a cheerful sort, how completely likewise does it assert its essence,--a sunbeam falling through that past from beginning to end. All the vexatious annoyances of the period that then seemed to counterbalance pleasure are lost to view, and only the rosy face of an experience that was happiness itself smiles upon him. What matter the myriad frets that then beset him in the flesh? They were superficial substance,--burrs that fell; he was happy in spite of them; he does not remember them; he sees nothing but the complete content; he in fact possesses his experience only in the ideal.