This chapter continues the discussion on thinking about the sun. It examines Descartes' principle (D): “No being for a thing in my mind without a causal process inculcating information from it into my mind”. It argues that the principle tends to engender two recurring worries in most students (audiences). First, there is a worry about the fabric (composition) of the sun-traces: what are the sun traces just mentioned thereof? This is the trace-fabric question. The second worry concerns that apparent dismissal of Descartes' one object, two modes principle. This is the representational-role question.
Keywords: Descartes, thinking, sun, knowing, trace-fabric question, representational-role question