"The Principles of Uncertainty" is an irresistible invitation to experience life through the psyche of Maira Kalman, one of this country's most beloved artists. The result is a book that is part personal narrative, part documentary, part travelogue, part chapbook, and all Kalman. Her brilliant, whimsical paintings, ideas, and images-which initially appear random-ultimately form an intricately interconnected worldview, and idiosyncratic inner monologue. Kalman contends with some existential questions——What is identity? What is Happiness? Why do we fight wars? And then, of course, death, love, and candy (not necessarily in that order).