The poem Vingtième Siècle (Pleine Mer—Plein Ciel) forms the climax of the Légende des Siècles, and presents in mythical form a picture of man's ascent through science, out of a state of ignorance, slavery and hatred, into one of enlightenment, freedom and brotherly love. Hugo typifies the idyllic future by an air-ship, (Plein Ciel), the sombre past and present by the colossal steamship “Léviathan,” (Pleine Mer). The same idea, of the deliverance of man through science, had found expression in Le Satyre; but there locomotive, steamer, and airship were equally honored as factors and symbols of man's emancipation, one leading up to and merging into the other. The invention of the steamship was specifically celebrated in the lines:Qui sait si quelque jour, grandissant d'âge en âge,Il ne jettera pas son dragon à la nage,Et ne franchira pas les mers, la flamme au front! (ll. 611–613)