Treat nature by the cylinder, the sphere, the cone, everything in proper perspective so that each side of an object or a plane is directed towards a central point.
Painting, like any art, comprises a technique, a workmanlike handling of material, but the accuracy of a tone and the fictitious combination of effects depend entirely on the choice made by the artist.
Everything in nature is formed upon the sphere, the cone and the cylinder. One must learn to paint these simple figures and then one can do all that he may wish.
