I think that if the previously blind person analyses the shapes in the right way, they'd be able to tell which one is the sphere and which one is the cube: The

I think that if the previously blind person analyses the shapes in the right way, they'd be able to tell which one is the sphere and which one is the cube: The only things the person would be able to gain from just touching the objects is that the sphere is "the same all over" and the cube is "not the same all over", to dumb it down considerably. If the newly unblind man looks at the objects in a similar way and considers symmetry, I think he would be able to tell that one is infinitely more symmetrical than the other and would be able to deduce that the shape that looks the same all over would be the sphere. Does that make sense?