Lights

The phrase lights, camera, action is heavily associated with the all forms of the entertainment business.  Similarly to the chicken and the eggs relationship the light and camera partnership needs each other to survive.  Granted, advances in technology are making every effort to add specs to the camera to manipulate the light in the shot.  I believe there is a lot to be said about the old fashioned style of shooting the business successfully used before the spoils of technology.  The ability to place and manipulate lights can create the directors vision of what is captured and how the shot communicates with he audience.  The intensity or brightness of the light and the color of the light can create different effects.  

In a scene I am writing the main character is is going though a lot of pain and trepidation.  I would hope the lighting could capture the emotion through the characters face.  To capture a grimace or ache by the twitch in the corner of a persons mouth requires precision not only with the camera but with the lights as well.