Instead of devising an expert system with rules about how to divide a task into subtasks, and how to carry along with each of those, a system like ours relies on more basic assumptions. The rules of physics, unlike the rules of design, are not an artificial creation, and this leads to original designs, because the evolutionary algorithm explores design space in ways which are not so strongly pre-determined by our culture.
This is the reason why our evolved structures have an alien look, which prompted Ronald and Sipper to observe that they exemplify ``surprising surprise, where we are totally and utterly taken aback'' [116, p. 525]. According to them, these Lego artifacts lack the familiar look that helps us trust and use a structure produced by classic engineering. However, we see their comments as a strong encouragement, for among the most ambitious goals of AI is that of expanding the human mind by introducing new ways of thinking. We believe that useful inventions, no matter how weird they might look in the beginning, are eventually incorporated into the culture if they are useful. Just as today we trust our lives to an airplane (which at first glance seems utterly incapable of flight), tomorrow we may walk over bridges designed by ALife.