What If . . . Collected Philosophical Thought Experiments is a brief, inexpensive collection of over 100 classic and contemporary "thought experiments", each with an accompanying commentary and thought provoking questions, which explore philosophical arguments and often address a genuine problem in life. The value of the book is in its simplicity in both format and tone: each thought experiment is accompanied by commentary that explains the importance of the experiment, and questions to provoke thought and discussion, all encapsulated within two pages. The book is direct, clear and conversational but does not dilute difficult ideas. Anyone interested in the major issues philosophers discuss, and how they use thought experiments to explore their arguments.Peg Tittle is the author of 'What If....Collected Thought Experiments in Philosophy', published 2004 under ISBN 9780321202789 and ISBN 0321202783.