Amen to Marvin's post.
If any evidence of insight or mechanical advantage might exist based on the inclination or preference for using the right or left hand doesn't really matter much. Without contrary evidence would anyone really want to switch hands?
And why suggest that bad drawing, impressionism, bad drawing, or expressive painting be associated with left handed preference?
I have no idea why I am mechanically right handed but it would take no more than a day or two to switch if somebody had any good evidence to do so. As Marvin suggested, it's got to do more with what's between the ears
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