(1) Shade and texture
Cross-Hatching in art gives the illusion of texture because it is a structure of lines that give a rough feel. It gives value because as you work out, the darkest shaded area is the area with the most crossing lines.
(2) Illusion of texture with paint
Impasto is where paint is thickly laid on a canvas with a artist-knife and it is built up to give texture and the paint also comes off the canvas.
