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Crazy eight!
The crazy eight exercise was a great warm up to get ideas flowing. By crudely sketching on paper while not worrying about perfect lines, creative solutions could come to life as fast as I was drawing.
Solution sketch!
For still quick but more refined ideas, a solution sketch was an important additional to my brainstorm tools. As I was trying to find the meaning of one of my crazy eight doodles, I was able to find solutions that I wouldn't consider before.