"Suppose we take a set of Lego blocks, and the things we can construct with them, as the domain of a very simple science. We can list all possible ways of attaching two blocks together, and then use that list to describe how to attach a third, a fourth, and so on, recursively. Eventually we have descriptions of an immense set of objects – walls, bridges, houses, and of course many objects that have no meaning for us at all. Now suppose, further, that before we start testing this theory of Lego objects, a mischievous daemon introduces an identical, slight, imperceptible curvature in the shape of each block. We will have no knowledge of it because it is so slight as to unmeasurable in individual blocks. The first objects we build will be in accord with the theory that we developed for perfectly rectangular blocks, but as they grow, we may find that many objects can’t be completed because the members become warped in various ways, as a result of an accumulating curvature. On the ot