I was thinking more along the lines that without the eye, the idea of light being projected in any direction at all has no meaning =) And then we could get star

I was thinking more along the lines that without the eye, the idea of light being projected in any direction at all has no meaning =) And then we could get started on the concepts of time and ordering. But since I'm no longer a third year physicist contemplating the nature of existence, I just simulate light statistically. And sometimes that means doing things like "Photon Mapping", which is precisely raytracing, but the kind of raytracing you get when you know how to optimize an algorithm implemented as a computer program. http://en.wikipedia.org/wiki/Double-slit_experiment#Delayed_choice_and_quantum_eraser_variations http://en.wikipedia.org/wiki/Double-slit_experiment#Delayed_... http://en.wikipedia.org/wiki/Interpretations_of_quantum_mechanics http://en.wikipedia.org/wiki/Interpretations_of_quantum_mech...