dimensions and colour of the TARDIS police box props used in the series have changed many times, as a result of damage and the requirements of the show, and none of the BBC props has been a faithful replica of the original MacKenzie Trench model. Numerous details have been altered over time, including the shape of the roof, the signage, the shade of blue paint, the presence of a St John Ambulance emblem and the overall height of the box. The original prop remained in use for around 13 years until it collapsed – reportedly on Elisabeth Sladen's head. A new prop was introduced for The Masque of Mandragora in 1976, and there have been at least six versions in total. The evolution of the prop design was referenced on-screen in the episode "Blink" (2007), when the character Detective Inspector Shipton says the TARDIS "isn't a real [police box]. The phone's just a dummy, and the windows are the wrong size." Interior design The TARDIS console room was designed for the first episode by set designer Peter Brachacki and was unusually large for a BBC production of this time. It was noted for its innovative, gleaming white "futuristic" appearance. Like the police box prop, the set design of the TARDIS interior has evolved over the years. From the inception of the show in 1963 up until the end of the "classic series" in 1989, the design of the TARDIS console room remained largely unchanged from Brachacki's original set, a brightly lit white chamber, lined with a pattern of roundels on the walls and with a central hexagonal console which contained a cylindrical "time rotor" that moved when the TARDIS was in transit. Numerous alterations were made to the central console and to the layout, but the overall concept remained constant. In Season 14 (1976-77), a dark wood-panelled "Control Room Number 2" was briefly used for a few episodes, but the white console room set was reinstated in Season 15, due to damage to the set. After the cancellation of the television show, a radically redesigned TARDIS set was used in the 1996 TV movie, heralding a move to a more steampunk-inspired set design, which later influenced the set design in the revived series from 2005 onwards. Depiction of time travel The production team conceived of the TARDIS travelling by dematerialising at one point and rematerialising elsewhere, although sometimes in the