When I am not animating for a client, I like to create short pieces, usually away from vector-based symbol characters, to experiment with a looser, drawn/sketch-like feel. As animation can be time-consuming, I follow a few self-imposed rules and set a one-hour animation deadline. Characters are typically mocked up in 10-15 minutes and the remainder of the time is spent on clean-up and the addition of colour or texture. I have a tremendous amount of fun creating and continuously learning from each exercise. 
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