> But why is virtual reality associated with small screens and head tracking?
Because it's supposed to simulate reality -- and it does a great job of it. Everquest on a CRT doesn't simulate reality; it's nothing like reality. As the capability of something increases it becomes something else. Cruise control on a car that is sufficiently able to drive a car eventually becomes autopilot. Your own server isn't a cloud but put a large enough of them acting together in a way where each individual machine is entirely redundant and replaceable is a cloud. These words describe actual things. You are a person but why isn't any random clump of cells a person?
Because it's supposed to simulate reality -- and it does a great job of it. Everquest on a CRT doesn't simulate reality; it's nothing like reality. As the capability of something increases it becomes something else. Cruise control on a car that is sufficiently able to drive a car eventually becomes autopilot. Your own server isn't a cloud but put a large enough of them acting together in a way where each individual machine is entirely redundant and replaceable is a cloud. These words describe actual things. You are a person but why isn't any random clump of cells a person?