Colourful river

I think the river bank is getting more colourful now to embrace the longer darker colder nights ahead. With also the firework season coming, the river is more photogenic everyday.
When appreciating the river bank from bridges, I have noticed that there is a shadow of Big Ben casting on the parliament building, and get me wondered where the lighting for such a nice shadow coming from. However, after moving forward across the bridge, the shadow disappeared!!!! It was just a silhouette of another tower, but makes the perfect illusion of shadow.
Amazing.

BTW, the phone camera is really not bad quality for a night scene!