In Zen, what is suchness? Is it the nature of emptiness?
Suchness is the physical reality. Take a look at a fallen leaf. It is what it is. That’s how it looks like. No amount of meditation or psychedelics will make it look any different, maybe only temporarily. That’s reality.
The nature of emptiness is not suchness, the nature of emptiness is the dreaming mind, the unreality. Your self-image, what kind of person you think you are or want to be, how you relate to other people, your goals, aspirations in life, your emotions, your struggles, your pride, your accomplishments, your hatred, your love, your fear, your anxiety, your longing, your relationships, your gender - this whole intricately complex inner world which you inhabit is empty, and is ultimately self-created. All spiritual practices and methods are designed to bring all this stuff to the level of consciousness, see it, experience it and let it go. All spiritual experiences, however scary, blissful or profound they may be, also happen in your mind, not reality. Just like dreams.
The total and complete destruction of this inner world is the process of spiritual enlightenment, and the realization of suchness lies at the very end of the spiritual path.
To see things as they are, all dreaming must cease.