First of all, what exactly is a wall sconce?
A sconce is just a fancy way of saying wall light or wall lamp. Wall sconces are essentially lamps attached to a wall. They are great for making the most of small or narrow spaces and can provide indirect lighting for stairways, corridors, bathrooms, and other narrow spots. They can also be used as task lighting or to highlight works of art. They can cast light upwards, downwards, or in both directions (unidirectional).