“And yet, such digging becomes easier if we start from
the assumption that in every tool we create, an idea is embedded that goes beyond the function of the thing itself. It has been pointed out, for example, that the invention of eyeglasses in the twelfth century not only made it possible to improve defective vision but suggested the idea that human beings need not accept as final either the endowments of nature or the ravages of time. Eyeglasses refuted the belief that anatomy is destiny by putting forward the idea that our bodies as well as our minds are improvable. I do not think it goes too far to say that there is a link between the invention of eyeglasses in the twelfth century and gene-splitting research in the twentieth. Even such an instrument as the microscope, hardly a tool of everyday use, had embedded within it a quite astonishing idea, not about biology but about psychology. By revealing a world hitherto hidden from view, themicroscope suggested a possibility about the structure of the mind. If things are not what they seem, if microbes lurk, unseen, on and under our skin, if the invisible controls the visible, then is it not possible that ids and egos and superegos also lurk somewhere unseen? What else is psychoanalysis but a microscope of the mind?”