I'm going to posit this. The Tardis is a tesseact wrapped in a texture. Its arms are fractal branches like a mandelbrot set, with the tardis sensing where you want to go and shortening, changeing paths ahead of you like a haunted hause. It does have an arbitrary center, like the cold spot in ur own universe. This is the stellar eye.
The 1996 movie is just the access port directly "above" its core.