Here's why:

* Diffuse reflection occurs when light rays hit a rough or uneven surface and are reflected in many different directions. This is because the surface irregularities cause the light rays to scatter.

* Specular reflection occurs when light rays hit a smooth surface and are reflected in a single direction. This is why you can see your reflection in a mirror.

So, if you're looking at a rough surface like a wall or a piece of paper, you're seeing diffuse reflection.