generate questions: Beginning in the late 1910s and early 1920s, Whitehead gradually turned his attention from mathematics to philosophy of science, and finally to metaphysics. He developed a comprehensive metaphysical system which radically departed from most of western philosophy. Whitehead argued that reality consists of processes rather than material objects, and that processes are best defined by their relations with other processes, thus rejecting the theory that reality is fundamentally constructed by bits of matter that exist independently of one another. Today Whitehead's philosophical works – particularly Process and Reality – are regarded as the foundational texts of process philosophy.
During which decade did Whitehead's focus start shifting away from mathematics? {sep_token} After moving away from mathematics, what subjects did Whitehead explore? {sep_token} As opposed to physical objects, what did Whitehead believe reality is composed of? {sep_token} What was the predominant theory of reality that Whitehead opposed? {sep_token} What book of Whitehead's is now considered a primary source of process philosophy? {sep_token} What did Whitehead first study? {sep_token} What was Whitehead's second area of study? {sep_token} What was Whitehead's final area of study? {sep_token} What type of system did he develop? {sep_token} What did Whitehead argue reality consists of?