Mono Monday challenge

It is hard for me to find a photo on days like today when I have been stuck in my home office all day and it is dark early. 
So the daily challenges are a good way to find inspiration by retouching an earlier photo and today I immediately thought of this photo I took a couple of weeks ago as the metal replies to the glass and the cloud free sky the grey one (I used a photo of the bridge already here: https://www.blipfoto.com/entry/2790298448962784545 ) 
Thank you Picturemull for the challenge!