In zen we say you are enlightened to the hat of the mind or the source of the mind. Phenomena keep changing means that your mind your thoughts keep changing. Thoughts keep manifesting from the mind, so we keep attaching to the phenomena created by the mind.
When you are enlightened, you realize the mind without manifestations. You realize that all phenomena cannot be differentiated which one is first or second since all are manifested from the mind simultaneously. For enlightened beings, they are clearly aware of existing phenomena, but don’t differentiate them. When we practice in the zen hall, the purpose is to go back to this formless mind. We have to go back to this formless mind.