Great thread and I agree with many of the posters here. I think the most creative people are the ones who are simultaneously scientific/analytic and artistic.
I too have a son who is quite gifted in both physics and art. He will major in physics, partly I think because he considers art as just a fun hobby. It is a pity that some universities require you to choose between the sciences school or the art/humanities school, though most say taking classes in the other is common. Hopefully your child can use freshman year to explore before having to declare a major.
My son will attend CMU this fall (we realized at the last minute that he could submit an art portfolio online, so he did…that might have been the element that pushed him into the accepted category). His essay spoke of his penchant for looking at things from unique, even absurd, perspectives and how this fuels his love for both physics and fantasy drawing…not bad.