As an architect, I have always wanted to be able to create comfortable as well as well-designed spaces for every type of user. I believe that natural light is a major factor on creating certain type of mood on an environment, such as in the exterior as well as in interior spaces.
Whenever light hits an object, shadows are created as a consequence. The contrast between light and shadow creates very interesting and different effects, and the playfulness they provide make it easier, though still challenging, for a designer to create certain type of mood.