At the exhibition of futuristic concepts, the company Ericsson showed how computers would look like by the year 2020. Conceptual device Ericsson Spider PC looks like a spider. Instead of a display, a projector. Laser keyboard on the table. Since the display and keyboard are intangible, the number of peripheral devices is reduced to a minimum.
All these technologies already exist, in principle, such a system unit can be assembled even now.