The most fantastic input and output devices is holographic technology.

Holographic technology is the technology of recording and reproducing real three-dimensional images of objects based on interference and diffraction principles. The first step is to use the interference principle to record the information of the light wave of the object, that is, the photographing process: the object is irradiated by the object to form a diffuse object beam, and the other part of the laser as a reference beam to the holographic plate and superposition the object beam to produce interference, and converts the phase and amplitude of each point on the object's light wave into space. The intensity of the change is used to record all the information of the object's light wave by using the contrast and interval between the interference fringes.