The Shadow rules

An Enneagram style has a shadow. That shadow is not an evil thing, it is just the opposite of what your usual habits are.
The shadow can be very strong. For example, some Enneagram students and teachers see the humorist Bill Maher as a 7. He is a really strong and funny style One. He is angry and vents his anger against all sorts of stupidity. One of his books is called "New Rules," a giveaway of the inner structure of style One.
But he has a strong connection to his 7 shadow, so he is funny and entertaining, usually a hallmark of a 7. Listen carefully and you'll hear him angry and that anger is home base.