"Set limitations for your work" I think this is one of the single most important components of creating anything of value. It is very difficult to innovate on a blank and limitless canvas. Barry Schwartz wrote an excellent book about how increasing choice decreases our satisfaction with our decisions. I think this is the same with design/creation it is so much easier for our brains to process- I have these inputs, these constraints, now what can I do with what I have.