I understand how the color blue was used a lot in S4 to represent water, but why the exact same shade? In the final problem, a very specific shade of royal blue is always in the frame.

From John’s shirt (x)

To Mycroft’s tie (x) 

To Moriarty’s entire suit (x)

To the governor’s tie (x)

Almost every scene has the shade of blue represented in some way. Even momma Holmes got in on the fun

Not to mention the little girl on the plane’s bow, the guard’s gun straps, kid Sherlock’s outfit, etc….

Kinda reminds me of another shade of blue…hmm… Maybe a certain detective’s favorite color?