text: can someone explain in details the difference between 2-d and 3-d ??   in addition to everyone else, to illistrate the difference between 2-d and 3-d.  if you look at a wall, and forget about it having a fixed width, you currently see only 2 dimensions, a length, and a height.  for a 3-d object, have a look at an opened door, this door has the 2 dimension from before, a length, and a height.  it also has a 3rd dimension being the width.  in drawing, a 2-d wall  ----- |   | |   | -----  a 3-d box    -----  /   /| ----- | |   | | |   |/ -----