The Time of Variables is a fun book about the mathematics around us. Twenty-eight fascinating stories dedicated to different aspects of mathematics, accompanied by funny original drawings. For Orlin, calculus is a universal language that can express everything we encounter every day - love, risk, time and, most importantly, constant change. The theme of the movement of time is also reflected in the titles of the parts of the book - "Moments" and " Eternity,” and her characters range from Sherlock Holmes to Mark Twain to David Foster Wallace. With his characteristic humor and ingenuity, Orlin reveals the connections between mathematical analysis, art, literature and his beloved dog named Elvis. The author of the acclaimed "Mathematics with Silly Drawings" and in this book his goal is not just to captivate the reader with his favorite subject, but to make us wiser and thoughtful.