Book excerpt: Thought experiments are tools philosophers and scientists use to investigate how things are, without actually having to go out and experiment in the real world. This book presents forty-two philosophical thought experiments. Each thought experiment is illustrated by De Cruz (who is an illustrator as well as a philosopher), and is summarized in one or two paragraphs, which is followed by a brief exploration of its significance. Each thought experiment also includes a longer (approximately 2-page) reflection, written by a philosopher who is a specialist in the field. De Cruz's unique illustrations serve as visual and accessible starting points for classroom discussions in Intro to Philosophy courses.