Goalposts

Subjective experiences are neurologically evolved and psychologically optimized representations of sensory input. Using only the objective world we ought to be able to infer something about them. Your thought process here is interesting. Color is the optimal subjective encoding of light's frequency and amplitude. We use it to infer material (color) and structure (shading) when we're recognizing objects. The models inferred by machines almost necessarily have a similar shape; Provided they're being required to perform similar tasks. If we can make a neural network pass the Turing Test then it's model should tell us all sorts of things about humans.