Publicity blurb about supplying Exeter with trademarked Harkness Tables and Chairs, and the Harkness teaching style at Andover, Hotchkiss and Lawrenceville.
Any old oval table will do, it need not be exclusively supplied by the company that holds the Harkness name trademark. Student-centered, discussion-based, Harkness-style learning is pervasive among boarding and prep schools.