The final technology is virtual reality. Present versions use the brute force approach: feed images through goggles and headphones to eyes and ears. But if we can crack the dreaming problem, figure out how our nervous system encodes the data that reaches our minds as sensory perceptions, goggles and headphones will no longer be necessary. Plug a cable into a socket at the back of your neck for full sense perception of a reality observed by mechanical sensors, generated by a computer, or recorded from another brain.