 Along the vertical axis are ranged centered possible worlds (a possible world, with a designated agent a and time t within that world) representing different ways your actual environment could be like; and the same worlds are ranged along the horizontal axis representing different counterfactual circumstances of evaluation. This matrix reflects your commonsense dispositions to apply the term ‘water’ to different chemical kinds on the basis of whether it actually plays certain superficial roles described in other commonsense terms (‘clear’, ‘potable’, ‘liquid’,  etc).[12]