"it is based on the idea that our brains interpret the input from our sensory organs by making a model of the world. when sucha model is successful at explaining events, we tend to attribute to it, and to the elements and concepts that constitute it, the quality of reality or absolute truth. but there may be different ways in which one could model the same physical situation, with each employing different fundamental elements and concepts. if two such physical theories or models can accurately predict the same events, one cannot be said to be more real than the other; rather, we are free to use whichever model is most convenient."
i like the thought that even the universe could be said to be lazy.