The universe is complex -- really too complex for us to contemplate or interact with it while fully aware of everything that is going on, and how, and why. In order to function within this complex system, we create mental shortcuts, models, and frameworks that section off and simplify pieces of the world we exist in. These models are often as basic as cause and effect rules - if I put this kettle of water on a hot stove, the water will heat up - or they can be more complex and detailed - like scientific Theories.
No matter how detailed or specific these models are, though, what we have to remember is that they are just that - models. Mental shortcuts that help us explain how the universe works and anticipate outcomes. They are not, in fact, how the universe works. When we think or talk about the universe, what we're really talking about is one or more of those mental models, not the universe itself.
One of the most simplistic shortcuts that we make are binaries - good/bad, hot/cold, here/there, inner/outer, etc. With a little thought though, it is easy to see that in a complex system there can functionally be no simple binaries like those, as they all require context. I think this (and the fact that it is easier to memorize and recite) is why scriptures often have lists of "X is not Y, it also isn't not Y" statements. Vīmalakīrtī does this quite a bit. One exception is the start of Chapter 12:
The TathÄgatha does not arise from the four elements and is the same as emptiness.
The TathÄgatha is not the aggregation of the six sense faculties, and is beyond the eyes, ears, nose, tongue, body, and mind.
Which is to say, the Buddha can't be pinned in to one system - the TathÄgatha is empty of dependent characteristics, i.e., the four elements, which is to say that the Buddha is the same as emptiness.
Additionally, you can't try to understand, usually phrased as 'contemplate', the Buddha by using the typical inputs we normally use to understand the world - eyes, ears, nose, tongue, body, or mind. Those senses are not designed to contemplate emptiness.
The TathÄgatha is not a single characteristic, or diverse characteristics, has no notion of self or notion of others, is not free of characteristics or attached to characteristics.
No matter how complex of a model we try to devise, it will only ever be just that - a model. Because the TathÄgatha is teaching us about the the universe, not just giving us another framework to think about the universe, we have to try to let go of all the mental shortcuts we hang on to in everyday life to begin to really contemplate those teachings.