On the arbitrary idea of some String Theorists that some dimensions are "small". [Disclaimer: I'm not an expert; a genuine question on basic notion of the theory follows, pardon the excitement:] I don't get the arbitrary idea of some String Theorists that beyond the 3rd/4th dimensions the others are "small". They often use videos to show that if you zoom in you may see an "ant" on an object. But that's quite nonsensical and arbitrary. I mean, I could have good eyesight and see that. Or I could have good eyesight and see some of that. Where does the "small dimension" ends and when does "zooming" start? I think it's pretty much nonsense. Now, what if the extra dimensions basically make objects and space simply "bigger"? Look at what string theorists do in their basic tutorials: "We have 1 dimensions, if we stretch them we get a "bigger", 2 dimensional object". "If we stretch that, e.g. a rectangle, we get a "bigger", a cube, in the 3rd dimension". Now, why do they stop there and say the next dimensions (apart from time) don't apply? Why don't they apply the same principle and say an extra dimension would simply make something bigger? Or at least, it might make something have multiple instances of itself. But, I don't think that's necessary. Going from 2 dimension to 3, we never got something so bizarre, we just got something more .."spacious" and practically "big". What if, Doctor Who's Tardis?