[616] Which is that form (rūpa) that is internal, not the sound element (saddadhātu) … not the odour element (gandhadhātu) … not the taste element (rasadhātu) … not the tangible element (phoṭṭhabbadhātu)?
The eye base (cakkhāyatana) … the body base (kāyāyatana) — this is that form that is internal, not the tangible element.
Which is that form that is external, the tangible element?
The tangible base (phoṭṭhabbāyatana) — this is that form that is external, the tangible element.
Which is that form that is external, not the tangible element?
The form base (rūpāyatana) … edible nutriment (kabaḷīkāro āhāro) — this is that form that is external, not the tangible element.
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.