How do shadows change and what makes them change?

I'm pretty sure that... Shadows change when the angle of light shining on the object changes. Eg. A person standing in the sun just as it rises will have a longer shadow facing west because of the angle that the sun is at. Whereas the same person standing in the same spot at midday will have a shorter Shadow so the shadow will make the person look shorter. If the light (sun) is directly on top of the person, they mah have no shaddow.