Light and Attention
Attention is the behavioral and cognitive process of selectively concentrating on a discrete aspect of information, whether deemed subjective or objective, while ignoring other perceivable information.
Lots of artist uses light to draw attention to the theme they want to express, such as faces and hands or facial expressions in realist painting, which emerge sharply from dimly lit surroundings. Therefore lighting designers adopted this philosophy when they set up lumination infrastructure. Artificial narrow beam angle lighting was placed on certain spots to mimic such way to catch customers' eyes to the merchandises on purpose.