“Imagination, then, must be the flip side of memory, not so much a calling up as a calling forth. Yet imagination also relies on knowledge: on knowing what is—and is not—possible in this world of fact. Imagination plants the seed or buries the bulb knowing the seasons will shift, seeing, in the mind’s eye, April give way to August, the azalea to the rose, knowing that the red leaves of the maple will burnish in autumn, knowing that from this exact window, one can look down to the inlet where the moon’s reflection will be just another shimmering white blossom.”