According to current theory, our perceptions are the results of brain states, with the brain being some kind of computing device, with states or configurations within the computer mapping to different perceptions.
Total Darkness. We are in fact in Total Darkness. Out there there is no light, ie the sensations within the brain which we describe as light, which our vision is constituted off. This is because the sensation of light as we see it does not exist in nature. It exists only within the brain. Let us assume that there is a three dimensional world out there, with light sources reflecting off objects. The simple fact is light as you see it doesn't exist in nature, it is the effect of coded information exciting cells in the brain.
Direct Post Processing Induction. That is an intriguing geeky term. The kind of expression you could hear from Jeff Dean. What it could it possibly mean? It comes down to the brain, yours truly, how it works, and how by considering alternative views of its workings, We, or I, come to an entirely different view of how reality, and the way We function within it.