How do I know I am the same person I was yesterday? What will happen if I die tonight? Do you see exactly the same colours that I see? What is it like to be a bat? Imagine, and what if ...? In this book, philosopher Alec Thompson describes the techniques used by the world's top thinkers and creatives, from Seneca to Einstein, to ponder the big questions, illuminate the little questions, and come up with totally new questions about life, the universe and everything.