The adult TARDIS is a living, semi-sentient, creature of time calculations, trans-dimensional equations and exitonic circuitry. The Protyon Unit is the organic brain of a TARDIS. Male TARDISes tend to be dominant in TARDIS herds. TARDISes will "talk" to each other, given the opportunity. They will occasionally be drawn, like insects to a light source, out of their cradles only to be found lurking near the Prime Eye of Harmony. TARDISes believe that they were designed to be "as one" with time and space. They also believe that they are the ultimate evolution of the Time Lord race. A properly maintained TARDIS doesn't have emotions. But they can develop "affection" for their regular crewmembers.