Actually, you cannot contemplate a sense faculty and exclude its object and the related consciousness. They must all interact, for they inseparable. For instance, in talking about the eye, you must eventually introduce the object of sight, and the consciousness that conditions seeing. None of the three has true independent existence. Without object to look at, the eye does not function. If the eye is not present, then objects do not exist in a visual sense. Of course you might still be able to touch an object, but you would probably be unable to get an overall impression of its shape and size, and you would know nothing of its color. Colors, and to a large degree shapes, have no independent existence apart from the sense faculty of seeing. The third element—eye consciousness, which is one aspect of the primary mind, or sixth consciousness—is a mental phenomenon, but it cannot exist apart from its sense faculty and the sense object. Faculty and object must interact for volitional consciousness, or cognition, to arise. This interaction, in fact, includes the skandhas of sensation and perception. In your practice however, you may emphasize one over the other, or approach the interaction through one of the three. It is a matter of individual choice.

Through practice and contemplation, you will learn to constantly remind yourself that whatever you see is empty. None of the three components—sense faculty, sense object, or sense consciousness—stands alone. There must be interaction and interrelation. In other words, emptiness is also interconnectedness.