point of view of their inner effect on the observer. A point is a small bit of colour put by the artist on the canvas. It is neither a geometric point nor a mathematical abstraction; it is extension, form and colour. This form can be a square, a triangle, a circle, a star or something more complex. The point is the most concise form but, according to its placement on the basic plane, it will take a different tonality. It can be isolated or resonate with other points or lines. A line is the product of a force which has been applied in a given direction: the force exerted on the pencil or paintbrush by the artist. The produced linear forms may be of several types: a straight line, which results from a unique force applied in a single direction; an angular line, resulting from the alternation of two forces in different directions, or a curved (or wave-like) line, produced by the effect of two forces acting simultaneously. A plane may be obtained by condensation (from a line rotated around one of its ends). The subjective effect produced by a line depends on its orientation: a horizontal line corresponds with the ground on which man rests and moves; it possesses a dark and cold affective tonality similar to black or blue. A vertical line corresponds with height, and offers no support; it possesses a luminous, warm tonality close to white and yellow. A diagonal possesses a more-or-less warm (or cold) tonality, according to its inclination toward the horizontal or the vertical. A force which deploys itself, without obstacle, as the one which produces a straight line corresponds with lyricism; several forces which confront (or annoy) each other form a drama. The angle formed by the angular line also has an inner sonority which is warm and close to yellow for an acute angle (a triangle), cold and similar to blue for an obtuse angle (a circle), and similar to red for a right angle (a square). The basic plane is, in general, rectangular or square. Therefore, it is composed of horizontal and vertical lines which delimit it and define it as an autonomous entity which supports the painting, communicating its affective tonality. This tonality is determined by the relative importance of horizontal and vertical lines: the horizontals giving a calm, cold tonality to the basic plane while the verticals impart