The secret of its charm, which, indeed, it shares with earlier Renaissance art in general, is that this yearning after freedom has been felt with rapture, but not fully satisfied. The season of repletion and satiety is distant. Venus Physizoe appears to Francesco Colonna radiant above all powers of heaven or earth, because he is a monk and may not serve her. Had he his whole will, she might have been for him Venus Volgivaga, and he the author of another _Puttana Errante_. Nor has she yet assumed the earnest mask of science. This element of unassuaged desire, indulged in longings and outgoings of the fancy, this recognition of man's highest good and happiness in nature by one who has forsworn allegiance to the laws of nature, adds warmth to his emotion and penetrates his pictures with a kind of passion. The arts and scholarship, which divide the empire of his soul with beauty, have no less attraction of romance than love itself. Nor are they separated in his mind from nature. Nature and antiquity, knowledge and desire, the reverence for abstract beauty and the instincts of a lover are fused in one enthusiasm. Thus Francesco Colonna makes us understand how Italy used both art and erudition as instruments in the liberation of human energies. For the thinkers and actors of that period, antiquity and the plastic arts were aids to the recovery of a paradise from which man had been exiled. They could not dissociate the conception of nature from studies which revealed their human dignity and freedom, or from arts whereby they expressed their vivid sense of beauty. The work they thus inaugurated, had afterwards to be continued by the scientific faculties.
One word may finally be said about the peculiar delicacy of this book. The _Hypnerotomachia_ is no less an apotheosis of natural appetite than the _Amorosa Visione_. But it is more sentimental and imaginative, because its author had not Boccaccio's crude experience. It anticipates the art of the great age--the art of Cellini and Giulio Romano, goldsmith-sculptors and palace-builders; but it is more refined and passionate, because its author enjoyed those beauties of consummate craft in reverie instead of practice. It interprets the enthusiasm of Ciriac and Poggio, discoverers of manuscripts, decipherers of epigraphs; but it is more _naïf_ and graceful than their work of erudition, because its author dealt freely with his learning and subordinated scholarship to fancy. In short the _Hypnerotomachia_ is a foreshadowing of the Renaissance in its prime--the spirit of the age foreseen in dreams, embodied in imagination, purged of material alloy, and freed from the encumbrances of actuality.