J. Storrs Hall has described nanobot designs he calls “foglets” that are able to link together to form a great variety of structures and that can quickly change their structural organization. They’re called “foglets” because if there’s a sufficient density of them in an area, they can control sound and light to form variable sounds and images. They are essentially creating virtual-reality environments externally (that is, in the physical world) rather than internally (in the nervous system).
