made popular originally by games like Doom and Unreal, and books by writers like William Gibson (Neuromancer) and Neal Stephenson (SnowCrash)
if the virtual space is large enough, whole houses, cities, continents, planets can be defined and built, and usually a user can travel around and interact with all parts of that virtual space
"Hey dude! Get your virtual ass out of my virtual space! Or I'll frag your sorry ass!"