I think "Shadows" opens up an enormous range of subjects. They can be real shadows, figurative shadows, mysterious shadows, dark shadows, even white shadows. Besides, they are everywhere.
Even though I like Shadows, I chose transitions, because I feel like it is really open to interperetation, and would do well for all mediums. It could be a representation of transition between color, texture, time... I would love to see everyone's creativity with it!