Someone asked me what I make of John’s office at the surgery. Aside from the teddy bear (which is probably there to soothe small children with earaches- dull) there isn’t much there, is there? INCLUDING COLOR. Everything is blue. All of it. Except Mary. Orange. Complimentary color. We can presume John’s headed for Sherlock’s grave with Mary’s support. Does he look like somebody who’s moved on? He’s moved on. It’s a good life. But not a vibrant one.
It’s called using complementary colors to make a scene visually nice. Also, to make her stick more on the scene…don’t try to search for a deeper meaning when there’s none.