some evidence, such as the experiments by Lashley, points against localization. However, it is still too early to tell. There may be many copies of each module spread around, or modules may overlap physically; both of these effects would tend to obscure any division of neurons into "packets". Perhaps the complexes are like very thin pancakes packed in layers which occasionally pass through each other; perhaps they are like long snakes which curl around each other, here and there flattening out, like cobras' heads; perhaps they are like spiderwebs; or perhaps they are circuits in which signals travel round and round in shapes stranger than the dash of a gnat-hungry swallow. There is no telling. It is even possible that these modules are software, rather than hardware