Creativity is not an ability that you either have or do not have. It is, for example, and this may surprise you, absolutely unrelated to IQ. Provided you’re intelligent above a certain minimal level, that is.

But McKinnon showed in investigating scientists, architects, engineers and writers that those regarded by their peers as most creative were in no way whatsoever different in IQ from their less creative colleagues. So in what way were they different? Well, McKinnon showed that the most creative had simply acquired a facility for getting themselves into a particular mood, a way of operating, which allowed their natural creativity to function.