Summary: The extraordinary study that shows how light affects your health and emotional well-being.

A page-turning novel that is also an exploration of the great philosophical concepts of Western thought, Jostein Gaarder's Sophie's World has fired the imagination of readers all over the world, with more than twenty million copies in print. One day fourteen-year-old Sophie Amundsen comes home from school to find in her mailbox two notes, with one question on each: "Who are you?" and "Where does the world come from?" From that irresistible beginning, Sophie becomes obsessed with questions that take her far beyond what she knows of her Norwegian village. Through those letters, she enrolls in a kind of correspondence course, covering Socrates to Sartre, with a mysterious philosopher, while receiving letters addressed to another girl. Who is Hilde? And why does her mail keep turning up? To unravel this riddle, Sophie must use the philosophy she is learning—but the truth turns out to be far more complicated than she could have imagined.

By Frank O'Hara. Edited by Bill Berkson. Essay by Kynaston McShine.

Mark Eli Kalderon presents an original study in the philosophy of perception written in the medium of historiography. He considers the phenomenology and metaphysics of sensory presentation through the examination of an ancient aporia. Specifically, he argues that a puzzle about perception at a distance is behind Empedocles' theory of vision. Empedocles conceives of perception as a mode of material assimilation, but this raises a puzzle about color vision, since color vision seems to present colors that inhere in distant objects. But if the colors inhere in distant objects how can they be taken in by the organ of sight and so be palpable to sense? Aristotle purports to resolve this puzzle in his definition of perception as the assimilation of sensible form without the matter of the perceived particular. Aristotle explicitly criticizes Empedocles, though he is keen to retain the idea that perception is a mode of assimilation, if not a material mode. Aristotle's notorious definition has long puzzled commentators. Kalderon shows how, read in light of Empedoclean puzzlement about the sensory presentation of remote objects, Aristotle's definition of perception can be better understood. Moreover, when so read, the resulting conception of perception is both attractive and defensible.

2003 Paul Bunge Prize of the Hans R. Jenemann Foundation for the History of Scientific Instruments Judging the brightness and color of light has long been contentious. Alternately described as impossible and routine, it was beset by problems both technical and social. How trustworthy could such measurements be? Was the best standard of inten