Lights are designed to direct. Look around the room you are in right now, I would suggest that at least 90% of light sources you can see have a directional purpose. What I mean by this is that they are designed and organised for specific functionable reasons. For example, as I sit in my study the two easterly facing windows provide morning light, whilst the skylight gives afternoon. The green circular light on my laptop charger indicates the level of charge I have. The alarm clock numbers are illuminated by a soft blue colour as to not appear blindingly bright at night time. My phone has auto brightness settings to change its brightness depending on the environment it is in.
I have discovered through the progression of assessment 2, the implications of light and how they effect our day to day activity. Subconsciously we follow their directions daily. Often used as warning signals lights provide symbols which humans are programmed to understand. Traffic lights, pedestrian crossings, dishwasher warnings, fuel lights.
Lights are everywhere, both artificial and natural all you have to do is look for it.