  Suppose we take identity to be a relation and analyse thisnesses as relational properties, (So A’s thisness is analysed as being identical to A). Then thisnesses will be impure but intrinsic. In that case the world consisting of the three qualitatively identical spheres 3, 4 and 5 units distance apart satisfies the Weak but not the Strong Principle. And the world with the three spheres each 2 units distance from the others satisfies neither version.