Did you know that in Doctor Who, the Doctor’s bow tie is red if the episode takes place in the future, and blue if it is in the past?
It’s true for the tenth Doctor too. His suit was blue if they went forward in time and the brown if they went back in time.
Also when the tardis is going through the time vortex it is red if they are going forward in time blue if they are going back
does the Doctor know it?