Nomad Brush, a paintbrush stylus, will make its debut at Macworld/iWorld, which will be held Jan. 26-28, in San Francisco.

Don Lee, Nomad Brush creator, will conduct what he says is the world’s first digital “SpeedSketch Portrait Siri-es.” In this interactive Tech Talk session, three digital artists — Jonathan Grauel, Fabric Lenny and Corliss Blakely — will team with three audience members to create Siri-inspired “SpeedSketches” on their iPads.

Teams will work collaboratively, and draw upon inspiration from audience members to create their interpretations of Siri. Throughout the process, artists will also share digital sketching tips and ideas to inspire the digital art creation process. ThisTech Talk will be held at 10 a.m., Saturday, Jan. 28, at the Moscone Center.

The Nomad Brush booth will feature digital art stations as well as product giveaways. Also during the Exhibit, the professional digital artists from the SpeedSketch Portrait Siri-es will be available in the Nomad Brush booth providing digital art tips and creating art on their iPads. Nomad Brush is also inviting Siri enthusiasts who can’t make it to Macworld to share their own Siri-inspired creations on their blog through Feb. 3 as part of their “Portrait Siri-es Challenge,” giving fans the opportunity to vote on their favorite works next month.

The Nomad Brush collection includes Nomad Compose, a dual-tipped stylus and brush; the Mil Series, including the Nomad Mini for smaller canvases such as an iPhone, iPod Touch, or Android phones, and the Nomad Play for younger artists. For more info go to .