 The organization of the eye is essential to its proper functioning and indeed to it being an eye at all (Clarke 1738 [1928: 769]; Clarke and Collins 2011: 72). It is an emergent property. Collins does not explicitly make the point that since the organization of the eye is an essential property it must also be a real property. Perhaps he thought this obvious. Clarke’s response was to claim that the power of the eye to see is a fictional and not a real property (Clarke 1738: 790]; Clarke and Collins 2011: 100).