Doors

I haven't been shooting much lately, because I am working around here, and out observing until late at night.  So I have been looking at things I have shot but not posted.  I was walking around the grounds of Mass MoCA and I passed these doors.  I was attracted to them as a photograph because the scene is monochromatic - all one color.  But I liked the subtle differences in the brightness and tone throughout the picture, and the small bits of rust here and there.  Something different, I thought.