Black & White day 2

Day 2 of my B&W challenge while at work this morning I noticed out the window that there was a Rainbow up in the sky. Knowing I was doing this challenge i was a little disappointed as I thought what a waste of an opportunity , I then wondered what the shot would look like in B&W , I believe it works hope you all agree.The only problem with the shot is that it was taken through a window so am getting some reflections from the office lights.