Emptiness in mind and in reality
Subtleties... The concept of emptiness is a mental object that is predicated on other things. We only get to the concept of emptiness by seeing through and negating the fullness (meaningfulness) of other concepts.
The experience of emptiness in not predicated on the concept of it. To experience emptiness is to see that 'emptiness' is no more real than 'fullness'.
If one holds the concept of a thing-in-its-own-right (an 'own thing'), one must hold the concept of its negation (that which is 'not-such'). If one holds the concept of a negation, one must hold a concept of that which has been negated (a thing-in-its-own-right). So what lies beneath those concepts?