Among so many luminous points, or rather in such a general blaze of light, there are yet dark nooks in his mind; corners that remain in shadow. By not maintaining a rigid distinction between concrete history and the philosophy of the spirit, Vico allowed himself to suggest historical periods which do not correspond with the real periods, but are rather allegories, the mythological expression of his philosophy of the spirit. From the same source arises the multiplicity of those periods (usually three in number) which Vico finds in the history of civilization in general, in poetry and language and practically every subject. "The first peoples, who were the children of the human race, founded first the world of the arts: next, after a long interval, the philosophers, who were therefore the aged among nations, founded the world of the sciences: with which humanity attained completion."[44] Historically, understood in an approximate sense, this scheme of evolution has some truth; but only an approximate truth. In consequence of the same confusion of history and philosophy he denied primitive peoples any kind of intellectual logic, and conceived not only their physics, cosmology, astronomy and geography as poetic in character, but their morals, their economy and their politics as well. But not only has there never been a period in concrete human history entirely poetic and ignorant of all abstraction or power of reasoning, but such a state cannot even be conceived. Morals, politics, physics, all presuppose intellectual work, however imperfect they may be. The ideal priority of poetry cannot be materialized into a historical period of civilization.