Never mind ‘chasing the light’ or ‘writing with light’ (graphos+foto), instead listen for when the light calls your name and you respond by a double-take to look with renewed care at the scene as it presents itself, or as you foresee that it will come to be after a few minutes or hours or days.
Consider the case of music – some tunes and lyrics may speak to you, while others do not. Worse, some combinations of rhythm and chord sequences may actually irritate or contradict your own sense of harmony and consonance. The same could be said for other sensory experiences like the way food is arranged on a plate, the way that people dress, or the emotional response to things in the landscape (cityscape, or social landscape) you inhabit: certain features and patterns can be a calming source of continuity that meets the expectations you have about the way things should look and when and how things should arise there.
Turing back to the illumination in day or at night that stimulates the receptors inside one’s eyes, there is a kind of language or patterned sequences of meaning that speak to people. Some have an “ear” for the voice or music of the light falling on the surfaces of places where they may go. Others barely respond when the light declares something in a quiet voice, or shouts at full volume. And still others develop a habit to keep a picture-taking device within easy reach to respond effortlessly whenever the light utters a word or invites a response.
Raising the lens and framing the subject, you can quote verbatim what the light is saying. Then you can share this with others, or add to your album of moments written with light. Even before cameras became commonplace, there were a few people with sketchpad and pencil or pen to capture compositions that they stumbled upon, searched out, tracked down, or synthesized from their own imaginations. But now that digital cameras, phones, and tablets are so wide-spread, the opportunities have improved to sharpen your focus and improve your ear to hear when the light is speaking in its own language. Hopefully, the ability to understand what it is that the light is saying also is improving.