Reflection: the throwing back by a body or surface of light, heat, or sound without absorbing it.
Reflection is the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated. Common examples include the reflection of light, sound and water waves. Wikipedia
Reflection photography, also referred to as mirror photography, is when you use reflective surfaces to create an artistic echo of a scene. This type of photography can add an interesting spin to locations that are hotspots for photographers such as oceans, lakes, puddles, and even rain drops.
I love looking at the normal image and then seeing if I can find a reflection / different angle / different image, water can be the best mirror, but the water and texture of the water gives the images and extra layer of texture.