Dark and Light

I was driving home from work in a bit of a rush this evening after an afternoon at the Parliament. Due to the city centre diversions caused by the tram works, I was heading up Market Street towards the Mound, when the sky lit up in front of me. I just had time to catch this as I was held at the traffic lights, and it was shot through the car windscreen. The silhouette on the left is of course Edinburgh Castle.