That things are empty is an ultimate teaching and is also a path quality of Buddha-dharma. The Sanskrit word is shunyata. It’s not a relative emptiness, but that doesn’t mean it abandons relativity. It’s a concept that points to our grasping at how something appears as some kind of otherness, as a singularity. Once emptiness is seen, everything comes back and is full as it is. This is the third turning teaching. Emptiness is dependent origination and a way to encourage us to look deeply at the way things are through the practice of sitting meditation.
https://www.youtube.com/watch?v=2rr0bJKCALk