CUBE, BALL, CONE, & CYLINDER -- These are shapes everywhere in nature. It helps to know how to shade, add texture, etc. Recognizing these shapes, simplifies the landscape or subject you're looking at. TONE, SHADING, SHADOW, & TEXTURE -- Tone is the actual color, shading is the part of object away from light, shadow is cast by the object, & texture is the rough, smooth, hilly, sharp, bushy, etc., feel or appearance of an object.