Fascinating philosophies from the late 19th and early 20th century continue to provoke and inspire the thinkers of today. This volume takes a close look at important developments of the era, beginning with the work of Friedrich Ludwig Gottlob Frege, a German philosopher and mathematician, and ending with the French existentialist Jean-Paul Sartre, who argued for the primacy of perception. Other notable philosophers from the period include John Dewey,...