[588] Which is that form (rūpa) that is internal (ajjhattika), derived (upādā)?
The eye base (cakkhāyatana) … the body base (kāyāyatana) — this is that form that is internal, derived.
Which is that form that is external (bāhira), derived?
The form base (rūpāyatana) … edible nutriment (kabaḷīkāro āhāro) — this is that form that is external, derived.
Which is that form that is external, not derived (no-upādā)?
The tangible base (phoṭṭhabbāyatana), the water element (āpodhātu) — this is that form that is external, not derived.
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.