[506] The fourfold classification of form (catubbidhena rūpasaṅgaho):
Form (rūpa) that is derived (upādā): there is that which is clung-to (upādinna); there is that which is not clung-to (anupādinna). Form that is not derived (anupādā): there is that which is clung-to; there is that which is not clung-to. Form that is derived: there is that which is clung-to and subject to clinging (upādinnupādāniya); there is that which is not clung-to but subject to clinging (anupādinnupādāniya). Form that is not derived: there is that which is clung-to and subject to clinging; there is that which is not clung-to but subject to clinging. Form that is derived: there is that which is impinging (sappaṭigha); there is that which is non-impinging (appaṭigha). Form that is not derived: there is that which is impinging; there is that which is non-impinging. Form that is derived: there is that which is gross (oḷārika); there is that which is subtle (sukhuma). Form that is not derived: there is that which is gross; there is that which is subtle. Form that is derived: there is that which is far (dūre); there is that which is near (santike). Form that is not derived: there is that which is far; there is that which is near.
Form that is clung-to: there is that which is visible (sanidassana); there is that which is invisible (anidassana). Form that is not clung-to: there is that which is visible; there is that which is invisible. Form that is clung-to: there is that which is impinging; there is that which is non-impinging. Form that is not clung-to: there is that which is impinging; there is that which is non-impinging. Form that is clung-to: there is that which is a primary element (mahābhūta); there is that which is not a primary element (na mahābhūta). Form that is not clung-to: there is that which is a primary element; there is that which is not a primary element. Form that is clung-to: there is that which is gross; there is that which is subtle. Form that is not clung-to: there is that which is gross; there is that which is subtle. Form that is clung-to: there is that which is far; there is that which is near. Form that is not clung-to: there is that which is far; there is that which is near.
Form that is clung-to and subject to clinging: there is that which is visible; there is that which is invisible. Form that is not clung-to but subject to clinging: there is that which is visible; there is that which is invisible. Form that is clung-to and subject to clinging: there is that which is impinging; there is that which is non-impinging. Form that is not clung-to but subject to clinging: there is that which is impinging; there is that which is non-impinging. Form that is clung-to and subject to clinging: there is that which is a primary element; there is that which is not a primary element. Form that is not clung-to but subject to clinging: there is that which is a primary element; there is that which is not a primary element. Form that is clung-to and subject to clinging: there is that which is gross; there is that which is subtle. Form that is not clung-to but subject to clinging: there is that which is gross; there is that which is subtle. Form that is clung-to and subject to clinging: there is that which is far; there is that which is near. Form that is not clung-to but subject to clinging: there is that which is far; there is that which is near.
Form that is impinging: there is that which is a faculty (indriya); there is that which is not a faculty (na indriya). Form that is non-impinging: there is that which is a faculty; there is that which is not a faculty. Form that is impinging: there is that which is a primary element; there is that which is not a primary element. Form that is non-impinging: there is that which is a primary element; there is that which is not a primary element.
Form that is a faculty: there is that which is gross; there is that which is subtle. Form that is not a faculty: there is that which is gross; there is that which is subtle. Form that is a faculty: there is that which is far; there is that which is near. Form that is not a faculty: there is that which is far; there is that which is near.
Form that is a primary element: there is that which is gross; there is that which is subtle. Form that is not a primary element: there is that which is gross; there is that which is subtle. Form that is a primary element: there is that which is far; there is that which is near. Form that is not a primary element: there is that which is far; there is that which is near.
Form that is seen (diṭṭha), form that is heard (suta), form that is sensed (muta), form that is cognized (viññāta). Thus is the fourfold classification of form.
The Tetrad.
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.