The drawing, he cites as the most important part of the idea process, that, and sharing it with others. The idea is to let your thought process come to life, outside of your head. Visually, you need to see what's happening and bring the idea to life. While it's always best to write all of your good ideas down, drawing takes the process one step further, and while it's not a guarantee for the next big idea, it's definitely a surefire way to get the juices flowing. Be sure to check out Jack Dorsey speaking at the 99% Conference and tell me, when it comes to brainstorming and generating ideas, what methods work best for you?