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the TARDIS would cloak as something innocuous, but at some point in the past the cloaking device broke and that's why the TARDIS is *always* a police box.
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It's called a Chameleon Circuit:
http://en.wikipedia.org/wiki/TARDIS
( ,
Tue 26 Jun 2007, 14:15,
archived)
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It's called a Chameleon Circuit:
http://en.wikipedia.org/wiki/TARDIS