Print Photos Theme Ideas

My first idea of a theme that I already sort of developed would be the relationship between nature and modern/urban life. The juxtaposition between them is interesting to me because they are so different but in many cases, especially in New York, they are found coexisting. An example of these images would be plants found in places that you wouldn't find them, or pictures of technology found in nature. The second theme idea I have would be bright and vibrant colors contrasted by dull areas. I like this idea because it could go hand in hand with my first theme.