Translation of: La liânea y la mancha en el dibujo.

Learning to see : learning to see form -- Basic lines : learning the basic lines -- Mastery of lines -- Learning by doing : linear drawing -- Learning by doing : the energy of lines -- Sketchbook : the value of lines -- Learning by doing : modulated drawing -- Learning by doing : the variability of lines -- Sketchbook : line, space, and intuition -- Learning by doing : urban landscape using scribbles -- Sketchbook : usefulness of scribbling -- Analysis : spiral lines -- Learning by doing : shading with lines -- Sketchbook : hatching -- Analysis : scratchboard drawing -- Learning by doing : architecture with ornamental lines -- Learning by doing : drawing hatchings with a ruler -- Sketchbook : playing with lines -- Analysis : linear rural landscape -- Building up with tone -- Learning by doing : black shading using three colors -- Learning by doing : cubist shading -- Sketchbook : controlling the tones of the drawing -- Learning by doing : silhouetting light tones -- Learning by doing : trees in the landscape with grays -- Sketchbook : shading and contrast -- Analysis : building form with tone -- Learning by doing : an interior scene using shading -- Learning by doing : shading with pastel (in the style of Seurat) - Combining shading and lines -- Learning by doing : contours of shading -- Learning by doing : the logic of light -- Learning by doing : drawing with pigment and a cloth -- Learning by doing : drawing a facðade : line over tone -- Sketchbook : tone gradation -- Analysis : rendering rocks with lines and shading -- Sketchbook : structuring shadows.