In order to know something of the physical reality one must use physical senses. One cannot use non-physical sense(s). This is in some ways the mind-body problem. The mind being a different substance to body makes it difficult to explain how these can interact in any way.

The eyes, ears, nose, tongue, and body are physical organs. The brain too is a physical organ. In this way, experience can be explained to be fully performed by parts of the body with no need for inflation of entities.

In short, the mind is not a thing. The language represents it as an object, a reified one, when in reality it is a large complex set of processes. Although one may break these processes down to simpler ones, they ultimately remain processes.

A simple process like sitting does not belong to the object. For the object remains what it is regardless of whether it is sitting or standing. The processes are irrelevant to the existence of the object. Let us call it a particular. The particular remains this particular whether its properties or attributes (processes, qualities, or relations) change.

So attributes are not part of the object. A particular (object, thing) exists. Existence itself is not an attribute.