TARDIS 2005–10, the roundels are built into hexagonal recesses in the walls. Ever since the TARDIS was redesigned at the beginning of the 2010 series, there have been a range of different roundel designs around the console room. These include circular holes that are recessed deep into the walls, hexagonal holes that are lit from behind each face, round indents with brass rings around the outside, and a glass centre that is illuminated blue. In "The Day of the Doctor", when the TARDIS' control room briefly appears as the War Doctor's room, the Eleventh Doctor points out to the Tenth Doctor
Blue wall of silence Blue wall of silence The blue wall of silence, also blue code and blue shield, are terms used in the United States to denote the informal rule that purportedly exists among police officers not to report on a colleague's errors, misconducts, or crimes, including police brutality. If questioned about an incident of alleged misconduct involving another officer ("e.g.," during the course of an official inquiry), while following the code, the officer being questioned would claim ignorance of another officer's wrongdoing or claim to have not seen anything. The code is considered to be an example of police corruption and misconduct.