Maira Kalman is an author and illustrator whose work is colorful, funny, and keenly observed — she gets most of her ideas by simply walking around town. Her latest book, The Principles of Uncertainty is a journal in paint and prose, documenting a year of her life. Small, ignored things become monumental — like Bundt cakes and disposed sofas on the street. Kurt took her for a stroll on an obscure, narrow street in Lower Manhattan.