What is the effect of light as it measures the seasons? How does light leave different traces on the terrain—on a Pacific Island, in the Aegean Sea, high in the Alps, or in the forest? John Sallis considers the expansiveness of nature and the range of human vision in essays about the effect of light and luminosity on place. Sallis writes movingly of nature and the elements, employing an enormous range of philosophical, geographical, and historical knowledge. Paintings and drawings by Alejandro A. Vallega illuminate the text, accentuating the interaction between light and environment.