What black technologies do you think are likely to be realized in the next 100 years?

Virtual imaging technology is to reduce the phone to a similar photoelectric sensor like a watch, the same thing, people need when you can automatically image in the air, and then complete the transmission of the picture, complete the transmission of information, I think this point of technology is hopefully realized, and now the 3d technology has gradually matured, including the current virtual reality technology has also had a certain amount of development, although that is said to be now There are still some technical things in the limit, but I think 100 years is enough time to break through all these technical thresholds, can complete a virtual reality technology widely used, and reduce the cost of large-scale.