"You can't step in the same river twice". "Dogs bark at what they don't understand". "The doctor inflicts pain to cure suffering". The ancient Greek philospher Heraclitus was famous for such brilliant and provocative sayings, and today, more than 2500 years after they were written, his ideas about life, nature and the cosmos are as relevant as ever. In this guide, von Oech uses 30 of Heraclitus' epigrams as springboards to creativity. Treating each saying as a source of inspiration, he supplies amusing anecdotes, mind-bending riddles, hidden jokes and intriguing questions designed to topple old habits of thought and fire the imagination. The author shows how to reverse expectations, turn change to advantage and find novel solutions to the most intractable problems.