Seeing most likely takes place deeper in the brain, not in the eyes. One hint for this is that we see the world upside-down by default. Another is the evidenc

Seeing most likely takes place deeper in the brain, not in the eyes. One hint for this is that we see the world upside-down by default. Another is the evidence that visual evidence cannot be trusted in a court case. It then seems likely that the responsible brain areas can be activated by memory, as well as by the eye sensors. The level of reality at which all this is possible in different individuals is obviously an open question. Whether one can train this is also not entirely clear to most.