Reflection

Reflection brings a kind of symmetry to a picture, and it's often pleasing. It can also be used to create a bit of confusion for the viewer, such that it's not clear whether the picture is the real thing or the reflection of the real thing. Besides this, sometimes, due to the surface of the reflecting object, certain effects can be achieved. For example, a reflection of the mountains on a lake looks pretty normal, however if there's a ripple in the lake, then the reflection has curves to it, which might make it more interesting.

Reflecting surfaces are everywhere, so keep a lookout for them. Spectacles, a dew on a leaf, window of a car, puddle of water on the ground. Even the top of the car, as shown in this picture. A picture of the building alone is fine, however, the added reflection off the top of a car makes the picture slightly better.