I never saw it
This image came up unexpected. By that I mean I did not see this or envision it. What caught my attention was the late afternoon light. We had rain and overcast skies all day until late afternoon when the clouds broke and the sun came out casting long shadows. I saw the light against the bulding and grabbed my camera. I honestly did not see the window until I looked through the view finder and then it was all I could see. I moved around placing it in various positions in the frame while keeping my reflection out of the window. I also expected to convert it to black and white but I do like the subtle soft hues instead. I settled on this one and ran it through Topaz Adjust. I never saw it coming.