The Adobe Illustrator vector graphics software uses brushes to draw lines and shapes within images. Use your mouse to control the brushes, if you have a touch-sensitive tablet connected to your computer, you can also draw with a brush using its stylus. Illustrator's default configuration includes a set of common brush shapes and sizes, ranging from a small oval to a large round brush. Add your own unique touch to images that you create in Illustrator by modifying the program's brushes. Click the 'Brushes' icon in the toolbar on the right-hand side of the Illustrator window. A list of brushes opens. Type a percentage into the 'Roundness' text box. A setting of '100%' makes the brush perfectly round, a setting of '0%' makes the brush into a line. Percentages in between these two settings create an elliptical brush. Type the desired angle for the brush into the 'Angle' text box. An angle of '180' makes the brush point left, a 90-degree setting makes it point upward, a setting of '0' makes it point right, and '-90' makes the brush point downward. Click and drag the 'Diameter' slider to change the size of the brush. The smallest possible size is zero points, the largest is 1296 points. Add randomization to any setting, if desired, by selecting 'Random' from the drop-down menu next to the setting. Use the 'Variation' slider next to the drop-down menu to set the degree of variation. Type a new name for the brush, if desired, into the 'Name' text box. Click the 'OK' button to save the modified brush. Seamus Islwyn has been writing for radio, print and online publications since 2003, covering subjects from independent Canadian music to automobile smuggling in the Balkans. His work has appeared in the 'Tirana Times' in Albania, and he also composes and produces electronic music. Islwyn holds a Bachelor of Arts in English from McGill University and a certificate in radio broadcasting from Humber College. Source.