When a turtle object attempts to move beyond a window boundary, the turtle object stops because it cannot move outside the window boundary.
The turtle graphics window is simply a graphics window that is used as a playground when drawing turtles.
A turtle object is always in the turtle graphics window.
This in other words mean that, the turtle object cannot exceed the boundaries of the turtle graphics window
An attempt to move the turtle object outside its window will stop the turtle object;
This is so because the turtle object is always in the turtle graphic window, and it cannot move beyond it.
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