TARDISes prefer the environment of the Space-Time Vortex to the four-dimensional world. They have Curiosity Circuits to encourage them to leave the Vortex. These circuits have linear spools that must be periodically reset.
The Doctor's TARDIS might be attracted to the Artron Energy produced by the conscious minds of sentient beings collapsing quantum waves into History. That would explain why there is sentient life everywhere it materializes. It even possible that some of his travelling companions are selected based on their higher then average levels of artron energy.
The following color code is used:
- Black: For information from the TV Series, including Dimensions in Time, and 1996 TV Movie.
- Blue: For information from the Novels and Audios including Target, Virgin, BCC, and Big Finish.
- Green: For information from 'licensed' reference sources such as the Technical Manual, Doctor Who Magazine, and the Role Playing Games.
- Red: For information from unofficial sources -The Faction Paradox series, behind the scenes interviews, author's speculation, and popular fan belief.
The TARDIS Technical Index is copyright Will B Swift.