Doctor Who: The Evolution of the TARDIS KeyJune 22nd, 2014
Doctor Who fan Brian Terranova created this interesting study of the various TARDIS keys over the past 50 years as a celebration of Doctor Who’s 50th Anniversary. He created many of the keys himself beginning with Yale keys and gleaning what he could from various forums and what could be seen on screen. Some of the unique keys (like the Third, Fourth and Seventh Doctors’ are replicas made by Mooncrest Models).
Take a look at his DeviantArt page for more information on how his collection was put together.