Don Lee, CEO of Nomad Brush, was kind enough to meet with us for a few minutes on the floor of Macworld | iWorld 2012 last week to chat about his creation, which is one of the nicer brushes available for virtual painting on Apple's devices. Nomad's got a few different makes and models for various uses, but Lee says his goal for them is all the same: To provide a "good bridge between analog and digital painting." The brushes all do that -- they're solid brushes that respond well to the iPad's screen. But what they don't do is what all brushes and styluses can't yet do, and that's invoke pressure sensitive information onto Apple's glass screen. Lee says that it's actually a choice on Apple's part. He says that the software can determine the size of a touch o