In Integrationist Notes and Papers no. 14, Roy Harris discusses the concept of 'units' and why units are part of the human universe – in fact, why they are the result of contextually integrated activities: Staring hard at nature's apple-tree does not tell us whether the apple is a Natural unit. Engaging in communication with others amounts to each party 'exercising his or her own mind', as Harris tells us, and thereby – hopefully – entering into a dialogue. Crucially, communication is not about either party gaining access to the other party's mind. If indeed integrationism is a form of humanism, as Harris claims, then certainly integrationists could take part in current humanist debates, making clear how, if at all, an integrationist humanism differs from other humanistic schools. It is perhaps less surprising to be told that structuralism is an 'anti-humanist' movement, and that, as a consequence, humanism and anti-humanism are founded on mutually exclusive sign theories.