I'm glad to see we're on the same wavelength, hmm?

I was giving a simplified example - it works just the same with ten people - or a thousand. The point is that you can't measure the Tardis because it's always going to be relative to the individual observer.

That doesn't preclude the possibility of some sort of limitation - even the universe itself is finite. What it does mean is that it's not possible to measure it in three-dimensional terms. In 4th dimensional maths, you have to specify WHEN as well as where - you can only say that the Tardis had a certain volume at a certain time - that measurement can and will be wrong a second later.

That's my theory


I don't get you. In terms of the train, you'd just move the track from the front to the back. Not sure how a Tardis goes "into reverse mode". If you mean walking back out the room into the one you previously left, it can just be recreated if necessary.

The tardis is as large as you perceive it to be. We have only seen a small amount so we see that but if we went through the back entrance, where would that lead us?

There must be a back entrance as most places have them.

There is a back entrance (or rather, exit), seen in a second Doctor story (The Invasion IIRC, but I haven't had my coffee yet), It leads into the interior of the TARDIS's Police Box shell.

Narnia.

I'm not sure there is an answer. Since the size is not restricted to the bounds of whatever it is pretending to be then I suppose infinite.

Its one of those questions you could easily go round and round in circles with.

Surely the best plan is just to go with the answer "depends how you look at it".

That's pretty much the text-book definition of "relative".

Maybe it depends how far into the other or micro universe the tardis is capable of opening into... May it one day be explained. Or not, as I like a bit of mystery too! Small city will do for now

I don't know about small city, maybe a cruise liner. Looking to some experts on this kind of thing, have we been given descriptions of the size/mass of the TARDIS in the classic series, the novels and the audio plays?

Nope, we've been shown a lot of it and told it's huge, but no actual measurements have ever been given. I don't think the question of mass really enters into it, since that would be calculated in relation to something else and as far as we know the TARDIS exists in its own space-its interior mass shouldn't have any effect on anything outside it as it isn't in the same dimension, so it would weigh only as much as the Police Box shell weighs.

It's a similar anomaly to the Star Trek: The Next Generation one about the hologram room. Despite it looking around the size of a squash court when it's not in use, people inside it whilst it's recreating a city can be miles apart without walking into invisible walls.

Thanks Ting, knew you could be relied on. What kind of size are we talking? City sized? That being the case, you could feasibly set a whole series in there!