Fig. 1

The popping-out model of day science and night science. Day thinking proceeds in logical steps, and thus only ideas that are closely related to the current hypothesis can realistically be reached (symbolized by the isolated valleys in the lower part of the picture). But one can pop out to the much more open night science world, where leaps among ideas are made possible by intuition, associative thinking, unexplained observations, and loosely applied principles from other fields. When a new idea has been generated, one can pop back into the day below and test it efficiently using day science methods