 The ‘in some respects one, in some respects two’ possibility at the centre of Nagel’s analysis is related to a question about transitivity. Is it possible, for a given instance of experienced objects p, q, and r, for there to be unified consciousness of p and q, unified consciousness of q and r, but no unified consciousness of p and r? (The parallel in brain bisection cases? Call the ‘centres of consciousness’ in the two cerebral lobes A and C, the older unilateral brain below them B. Is it possible for a mental state in A to be unified in consciousness with one in B, one in B with one in C, and yet the state in A not to be unified with the state in C?) 