What is the term for an evaded sense of having no tonal center?

Classified ads often mentioned slaves' ability to play European instruments such as the violin because

a. owners wanted to know ahead of time if there were hobbies that might distract slaves from their daily chores b. these were highly desirable skills for potential owners, who liked to be entertained at dances and balls c. this usually meant a slave had above-average intelligence, and could become an overseer on the plantation d. "disclosure laws" had been established requiring such information to be included

An excellent example of the marriage of Christian imagery and the animal interlace of the north is the carpet page of the ________.

a. Book of Durrow b. Book of Kells c. Codex Amiatinus d. Lindisfarne Gospels