All the geometry of your drawing is contained in layouts. Model space geometry is contained on a single layout named Model. You cannot rename the Model space layout, nor can you create another Model space layout as there can be only one per drawing.

Paper space geometry is also contained on layouts. You can have many different Paper space layouts in your drawing, each representing a different configuration to print. You can change the name of the Paper space layouts.

The “*MODEL_SPACE” BlockTableRecord in the BlockTable contains all the geometry in the Model space layout. Because there can be more than one Paper space layout in a drawing, the “*PAPER_SPACE”BlockTableRecord in the BlockTable points to the last active Paper space layout.

For more information about working with Paper space layouts, see “Create Multiple-View Drawing Layouts (Paper Space)” in the AutoCAD User's Guide.