The discussion centers on the Copenhagen interpretation of quantum mechanics, debating whether it restricts knowledge or ontology. Participants argue that the interpretation suggests certain properties, like position and momentum, do not exist outside of measurement, challenging classical views of reality. The implications of the Bell theorem are explored, indicating that if something exists, it must adhere to non-local laws, contradicting local interpretations of nature. Some contributors emphasize that quantum systems lack classical properties until decoherence occurs, suggesting a need for a new understanding of quantum reality. Ultimately, the conversation reflects a tension between traditional physical realism and the non-representational views of quantum mechanics.