Rembrandt, not only exemplifies the impressiveness of great deviations in structural proportions in much the same degree as Michael Angelo, using what the Greeks and Dürer would doubtless have considered a dangerous liberty, however much they might have felt bound to admire the results obtained; not only does he do this when, for instance, he represents Jesus now as a giant, now as almost a dwarf, according to the imaginative impression which he chooses to create; but he follows a similar process in his black and white pattern. For among his works there are etchings, which, though often supposed to have been left unfinished, are discerned by those with a sense for beauties of this class to be marvellously complete, stimulating, and satisfying, and in the nicest harmony with the other impressions produced by the mental point of view from which the subject is viewed, as also by the main lines and proportions of the composition, and to yield the visual delight most suitable to the occasion. Dürer and the Greeks are at one with Michael Angelo and Rembrandt in condemning by their practice all purely mechanical application of ideas or methods to the production of works of creative art, such as is exemplified by artists of more limited aims and powers; by academical practitioners, by theoretical scientists calling themselves impressionists, luminarists, naturalists, or any other name. For artists whose temperaments are impeded by some unhappy slowness, or difficulty in concentrating themselves, methods of procedure similar to those elaborated by Dürer in his books on proportion, properly understood, must be a real aid and benefit; as those who are essentially improvisors may help themselves and supply their deficiencies by methods similar to those which Reynolds describes as practised by Gainsborough. "He even framed a kind of model of landscapes on his table, composed of broken stones, dried herbs and pieces of broken glass, which he magnified and improved into rocks, trees and water" (Fourteenth Discourse). This process resembles that of tracing faces or scenes from the life of gnomes in glowing caverns among coals of fire on a winter's eve; it is resorted to in one form or another by all creative artists, but it is peculiarly useful to men like Gainsborough, whose art tends always to become an improvisation, whatever strenuous discipline they may have subjected themselves to in their days of ardent youth. VIII