 Think of the example of a black dot moving across our visual field. Recalling our general rubric for change at the beginning of this section, we can affirm the first three premisses as statements about the content of our experience: (i) \(a\) is at \(x_{1}\) at \(t_{1}\), (ii) \(b\) is at \(x_{2}\) at \(t_{2}\), (iii) if anything is at place \(x_{1}\) at a time \(t_{1}\), then it is not at place \(x_{2}\) at \(t_{2}\). Now add in the content of the phi-experience: (iv) \(a=b\), and we deduce that \(a\) is also not at \(x_{1}\) at \(t_{1}\).