Wonder has been claimed as the beginning of philosophy by both Plato and Aristotle. Although an apparently similar claim, theessays in this collection represent a closer inspection of the difference in both location and content that define these two eminentthinkers' kinds of wonder. While Aristotle's understanding was outward-looking, directed to natural phenomena, and positioned at the beginning of inquiry with the assumption that explanation should purge it, Plato's before him was inward-looking, toward conceptual phenomena, and positioned not only at the beginning of inquiry but also as its pursuedend.Such different understandings are ones that have continued to be elaborated and developed throughout the history ofphilosophical conversation and so on to affect our feelings, understanding of and reactions to wonder.