俱舍論頌疏論本 2.3

2.3

Commentary: 'One is visible, namely form' means that among the eighteen elements, one element is visible, namely the element of visible form (rūpa-dhātu). Because colors and shapes have different distinctions here and there, they can consequently manifest expressions pointing to 'this' and 'that'; expression is called 'seeing' (darśana). Because there is that expression, it is called 'visible'. Another explanation: 'seeing' refers to the eye faculty observing visible form; because form possesses being seen by the eye, it is called 'visible'.