Well, I like and contribute to many communities, but if I have to select only one, that would be the "Black and White" community, @hive-142159.
For me as a pro-photographer Black & White is something special! As I often like to say, presenting a picture in monochrome strips the distraction of the colors and reveals the true beauty and soul of a photo. Removing the colors from a photo makes it more abstract too! :)