Movement in the screen world can be very different from movement in the real world. There are four types of movement that need to be defined.
Actual Movement
Actual movement only occurs in the real world. Almost everything that moves in our three-dimensional world is classified in this category. Walking people, flying birds drifting clouds, and moving cars are examples of the constant, actual movement we see every day.
Induced Movement
Induced movement occurs in the real world when a moving object transfers its movement to a nearby stationary object. The stationary object appears to move in the opposite direction and the moving object appears immobile.
The actual movement is the black circle and the green circle is ...
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