To be able to be truly innovative and creative, you cannot have your whole livelihood dependent on the results of the one thing. It is better to have more projects so you are not completely dependent on just one activity. This form of dependency kills creativity.
Many people tend to work at a place especially designated for working (such as an office), and they do not think at all about work when they are not there. However, the most successful people work at all times, such as when having a breakfast or going to or from work. Working does not necessarily mean physical activity, it may mean just thinking about a certain problem.
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Article source Forbes.com - prestigious American business magazine and website