William Isaacs has spent decades working with leaders and organisations to surface the invisible dynamics that shape collective thinking, drawing on Bohm's dialogue tradition and his own extensive practice to develop frameworks for listening at depth. In this talk, Isaacs focuses on what he calls the unnoticed languages: the registers of tone, posture, pace, and relational field that carry meaning independent of the words spoken. His argument is that skilled facilitation depends on perceiving these channels, not just managing content, and that most conversations fail at precisely this level. The work connects to his broader interest in the architecture of listening and the conditions under which genuine thinking together becomes possible.