at best what we experience is correlated with the external physical world. The colors we see, for example, are simply an interpretation of the wavelength of electromagnetic radiation, as arbitrary as the link between the letters in the alphabet and the sounds we have assigned them. At worst, we see a fiction imposed upon the mind from within: from the visions of someone suffering from schizophrenia, to drug-induced hallucinations, to the dreams we experience every night. And there is so much we don’t see: the bacteria living on our skin, the invisible galaxies in the sky, the muon particles
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