As basic rules of a language must be practiced continually, and therefore are never fixed, so exercises toward distinct color effects never are done or over. New and different cases will be discovered time and again.
Being in a multicultural environment in childhood is going to give you intuition, reflexes and instincts. You may acquire basic responsiveness later on, but it's never going to be as spontaneous as when you have been bathing in this environment during childhood.
I remember on 'JAG,' Joe Jackson punched Stephen Culp and shattered his nose.