 Representationalists of course respond by trying to specify distinct properties as characteristic representata in the differing experiences. For example, a “duck” experience of the duck-rabbit will represent the property of being a bill without representing that of being an ear; the “rabbit” experience will do the opposite. One way of grouping dots will mobilize the concept of a row but not that of a column, etc. Macpherson (2006) offers a rich survey of such examples and rebuts representationalist replies both existing and anticipated.