Here's why:

* Sunlight: The sun is a source of light that travels in straight lines.

* Blockage: When an object blocks the sunlight, it prevents the light from reaching the surface behind it.

* Shadow Formation: The area where the sunlight is blocked is the shadow. Since the light travels in straight lines, the shadow is formed on the side of the object away from the sun.

Think of it this way:

* Morning Sun: The sun is in the east, so shadows are cast to the west.

* Afternoon Sun: The sun is in the west, so shadows are cast to the east.

* Noon Sun: The sun is directly overhead, so shadows are directly beneath the object.

Let me know if you have any other questions!