The first is the Aggregate of Matter (Rūpakkhandha). In this term ‘Aggregate of Matter’ are included the traditional Four Great Elements (cattāri mahābhūtāni), namely, solidity, fluidity, heat and motion, and also the Derivatives (upādāya-rūpa) of the Four Great Elements.10 In the term ‘Derivatives of Four Great Elements’ are included our five material sense-organs, i.e., the faculties of eye, ear, nose, tongue, and body, and their corresponding objects in the external world,
