 Abelard’s solution, of course, will only work if he can motivate the claim that a thing in or having a condition is not a new thing. And medieval realists went after such reductivist programs in much the same way that some contemporary realists do. Specifically, they often presented truth-maker challenges, or “anti-Razor” arguments (see Maurer 1984): If at one time this sum of boards and bricks is not a house and at another time it is a house, then there must be some thing that is absent at the former time and present at the later time.