 The Direction of Time (Reichenbach 1956) was unfinished at the time of Reichenbach’s death in 1953. The manuscript was edited by his wife Maria Reichenbach, and published posthumously in 1956. The book was concerned with temporally asymmetric phenomena—phenomena that we associate with the distinction between the past and the future. It included major sections on the role of time in classical physics, thermodynamics, statistical mechanics, and quantum mechanics. It also included a section on temporal asymmetries in macrostatistics. Reichenbach had plans to include a final section on the subjective experience of time.