The
Space
Space
is defined as having 3 dimensions  length l, width w
and height h (or x, y and z). If one takes a box, you can
multiply l x w x h to define a volume
in three dimension, V(l,w,h). This is how we seen the world
with a Cartesian coordinate system (see diagram 1).
Diagram 1: 3D space
The
Object
An
object such as a box (cube) or ball (sphere) is often called 3D,
when in fact they are 4D. But to comply with conventional math principles,
we will proceed under current theory. Objects may be defined in
terms of the xyz coordinate system in 3D space (see diagram 2).
Diagram 2: Objects in 3D space
The
Observer
Like
the old adage, "if there's no one to hear it, will a falling
tree make a sound?", objects need the context of being observed
in order for them to be measured.
