Item MO022004: A model is similar to the thing it represents in some ways but different in other ways.

In what ways is a model similar to the thing it represents?

  1. A model must be identical to the thing it represents in every way.
  2. A model must be identical to the thing it represents in every way
    except that it can be made out of different materials.
  3. A model must be identical to the thing it represents in every way
    except that it can be a different size.
  4. A model can be different from the thing it represents in either its size or the materials it is made of.