We have a lovely visitor here at the moment. My little sister visits us on her way back to Germany. She lived in Australia for the last eighteen months and took the route through the United States on her way back. Needless to say that we proudly show her Dubuque and the landscape along the Mississippi River here. Being a "tour guide" gives me always a chance to scout new photo opportunities and to look for interesting subjects. While waiting for my sister outside an art gallery on Bluff Street in Dubuque, IA today, these two doors caught my attention. I had only the Nikkor 24-120/f4 with me, which is not really first choice for architecture photography of any kind. It is a sharp lens but as with many wide zoom lenses lens distortion can't be neglected. It took only little efforts to correct this in Photoshop.