your World (3DVR) is a model
to understand 3DVR Worlds
we must understand how they come into existence
they come into existence as an idea
"a space that belongs entirely to me, with nothing in it"
it belongs to me because it is built with my computer
now we want to put something in this space
let us say ... a postcard
we can describe it as being
a flat rectangular surface
four inches high, six inches wide
now we want to put it in our space
