When a body succeeds in emitting or in reflecting luminous vibrations in a distinct and recognizable order--I thought--what does it do with these vibrations? Put them in its pocket? No, it releases them on the first passer-by. And how will the latter behave in the face of vibrations he can't utilize and which, taken in this way, might even be annoying? Hide his head in a hole? No, he'll thrust it out in that direction until the point most exposed to the optic vibrations becomes sensitized and develops the mechanism for exploiting them in the form of images. In short, I conceived of the eye-encephalon link as a kind of tunnel dug from the outside by the force of what was ready to become image, rather than from within by the intention of picking up any old image.