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3D, or three dimensional, refers to the three spatial dimensions of width, height and depth. The physical world and everything that is observed in it are three dimensional. While many flat images such as films and photographs register visually as two dimensional (2D) to the human brain, nothing can physically exist without all three dimensions. This is because everything that exists materially is comprised of atoms which, despite being invisible to the naked eye, are made up of all three spatial dimensions.