[908] Which phenomena (dhammā) are visible (sanidassana)? The form base (rūpāyatana) — these phenomena are visible.
Which phenomena are not visible (anidassana)? The eye base (cakkhāyatana) … the tangible base (phoṭṭhabbāyatana); the wholesome in the four planes (bhūmi); the unwholesome; the resultant (vipāka) in the four planes; the functional indeterminate (kiriyā-abyākata) in the three planes; whatever form, being not visible and non-impinging (appaṭigha), is included in the dhamma base (dhammāyatana); and Nibbāna — these phenomena are not visible.
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.