How does this relate to Alice?

Alice 2.0 is not capable of modeling scenario 3.

It is not possible to write Alice code that will:

• Go to the gallery (the dressing room) and
• Instruct an actor (object) to materialize itself and go to the stage.

All of the actors (objects) that will appear at any point in the play:

• Must be manually created and transported to the stage.

Once an object has been manually created and transported to the stage, it can be made invisible.

Then it can become visible at the appropriate point in the play.