My not-professional understanding is that gifted children at that age are driven to explore and understand the world around them at a much deeper level than their peers. So while it's perfectly reasonable to introduce these things to a non-gifted child, there's no guarantee they'll learn it as well, because the gifted child might be captivated, and the non-gifted child might not be.
But even among gifted children, you might find some where shapes are completely boring and uninteresting, and they're even more tuned out/turned off than a non-gifted child, but something else will grab them and motivate them.
Just my two cents.
