Hi, I thought you may like this Mentalrobics exercise from Braingle.com:
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Boundaries of Knowledge

A creative [ For more on 'creative' go here: http://www.braingle.com/mind/609.html ] idea is one that somehow changes the existing knowledge of a particular field. This field may be anything from art to science to politics to sports. Before a person is capable of contributing a creative idea that advances our knowledge, that person must obtain mastery of the existing knowledge in that field. If a person has never studied physics, then they are not going to be able to come up with a creative idea in that field. Einstein was an expert in physics, which enabled him to push past the boundaries of knowledge and come up with creative thoughts that advanced our culture.

The more society learns about a field, the more difficult it becomes for an individual to master that area of knowledge. As a result, as society progresses, it takes more education for someone to get to the point where they are pushing the boundaries of knowledge. Albert Einstein had to learn more than Isaac Newton and current physicists will have to learn more than Einstein.

Because it takes longer to master the knowledge of mature fields, creativity is more likely to occur in new fields that require less effort to master or in the crossover between two unrelated fields. For example, biology and engineering are both mature fields of knowledge. Some creative people started producing ideas that merged the two disciplines and now we have a new field called "bioengineering" which is ripe for having lots of creative ideas.
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For more mind exercises: http://www.braingle.com/mind/