On the horizon of any human science, there is the project of bringing man's consciousness back to its real conditions, of restoring it to the contents and forms that brought it into being, and elude us within it; this is why the problem of the unconscious its possibility, status, mode of existence, the means of knowing it and of bringing it to light is not simply a problem within the human sciences which they can be thought of as encountering by chance in their steps; it is a problem that is ultimately coextensive with their very existence.