Counterpoint: Then why not ask, almost sneeringly, "do thoughts, then, take the shape of their container? Might they be in perpetual danger of spilling out?" But then thoughts, it is generally thought, do spill out frequently enough, and if they are actually contained by anything it wouldn't be the roughly 1,350 cc or so (on average, give or take a few hundred cubic centimeters) of space inside the human skull. 

Moreover a much more plausible candidate would be the kilometers and kilometers of nerve fibers branching out in all directions like a vast electric grid, forming the tree-like network of interconnections between trillions of nodes constantly sending and receiving impulses from all parts of nervous system(s) and the entire body at (nearly) the speed of light.