 There is a further disanalogy between perception of colour and perception of time order. What is perceived in the case of colour is something that has a definite spatio-temporal location. The relation of precedence, in contrast, is not something that has any obvious location. But causes do have locations, so the perception of precedence is rather harder to reconcile with the causal theory of perception than the perception of colour (Le Poidevin 2004, 2007).