As in drawing movement, the concepts of CONTINUOUS and REPETITIVE motion applies in painting. Line of action is also key to showing movement with a brush.Whereas in painting, the color provides an opportunity to experiment with aspects of motion without a distinct subject.
There are a number of brush stroke techniques for expressing movement. Here are three to play with. For this exercise use acrylic, gouache and/or watercolour paints on primed canvas or paper/sketchbook. Try using various size brushes right for the paint you use. Choose and mix colors.
Continuous Spiral – The object of this exercise is to understand the use of continuous line of color to express motion. Choose a start point on the surface and continue the line in a spiral until you run out of surface. Repeat the exercise again, when the paint dries using another color and with a different start point. Note that the continuous movement became an emerging repetitive pattern.
Repetitive Scrubbing – This exercise allows experiment with a line of colour in repeat brushstrokes using a scrubbing movement. Vary the speed and intensity of the brush stroke on the surface in various applications.
Continuous/Repetitive Dabbing – Use a brush you feel comfortable with. Try this exercise using broken line dabs in repetitive brushstrokes. Then use continuous line dabs (almost like wavy lines) to show continuous movement.