 Objection 3: We have already seen that Brentano subscribes to a Polarity Thesis: Acknowledging an object x has an opposite: rejecting x (see  section 1, claim 5).  These attitudes are directed towards the same object, yet only one of them can be correct even if they may co-exist, as Brentano allows. The correctness of acknowledging x is incompatible with the correctness of rejecting it. Hence, if non-epistemic perception is a kind of acknowledgement, it must have an opposite. But what could be the opposite of  seeing?[21]  According to Peter Geach, there is nothing here to be found except the exclusion relation between (instances of) properties that we see: