Based on the identified common properties, new class PassiveActor containing act() method should be implemented:

o   These classes (PassiveActor, Orb, and Direction) should be used for representing class hierarchy in the context of inheritance,

o   Teacher can visually represent class hierarchy by using the hierarchy diagram.

o   Teacher alerts the students what changed in the Greenfootenviroment when Actor in substituted with PassiveActor in the class