MC Escher's work--"Three Spheres" distinguish the world into three part. They are transparent sphere, opaque sphere, and reflective sphere. That results from the different viewpoints from observers and features of materials. It reminds me a brief story. One day, Karl Popper wanted his students mastered in Physics "Let's observe!" In the classroom, this students didnot know how to start the observation. That's because the observation should under a structure of "prior concept."
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