Here's why:

* Displacement is the change in position of an object. It's a vector quantity, meaning it has both magnitude (size) and direction.

* If the toy starts at a position and returns to the exact same position, its final position is the same as its initial position.

* Therefore, the change in position (displacement) is zero, even if the toy traveled a considerable distance.

Think of it like this: if you walk around your house and end up back in the same spot you started, your overall displacement is zero. You might have traveled a long distance, but your final position is the same as your initial position.