Shadows can add a lot to a photograph. They can emphasize emotions, create surreal images, and be used in a variety of ways. While strong use of shadows in color photographs tends to be mostly used in silhouettes, it can also appear in a variety of other forms in color photos as well. Shadows are most powerful when used in black and white photographs, but that is not a requirement. Aim for the dramatic!

The perception of seeing images of faces, animals ect. in clouds or objects