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Genius can be defined simply as high intelligence/ ability plus creativity - but what is creativity?
Although there is a scientific literature on creativity, describing its psychological mechanism and purporting to measure it quantitatively, there is a serious problem when science addresses creativity - a category error; in the sense that insofar as creativity is captured by science then science captures is precisely not creativity.
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What real creativity is, is something uncanny.
It can perhaps best be understood as a consequence of the bringing to bear nothing less that the whole personality upon a problem; not just for a Eureka-moment of illumination, but also for the preceding 'Genius Quest' which may last for years.
Creativity has a source beyond science - inspiration is both within and without; it both seems to come from inside by in-trospection; and from outside by being in-spired like breathing-in.
Creativity is thus an inner fire, and also a yielding to destiny - both are unique. Our inner fire is distinctive, and our destiny is also distinctive - therefore creativity is a key to working-out our uniqueness.
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The variations in real creativity between people are therefore in essence a matter of value - value to the creative person; so behind public perceptions and fashion, differences in underlying creativity correspond to a difference between those who are more- and less- spiritually advanced in terms of discovering, realizing and developing themselves - in the way, in the direction, along the path that is their unique destiny and necessity.