Objects are abstract computers. You decouple the notion of a "computer" from the physical hardware on your desk. The paradigm holds from a single object representing "1" right up to the internet (an object orientated network). Its objects all the way up and all the way, which is just another way of saying that it is "computers" all the way up and all the way down. A desktop PC can hold a thousand "computers" just as the internet can hold a million computers (each holding a millions computers).