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In page Wabash College:

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Rhyneship was a freshman orientation program that took first semester freshmen, "rhynes" and acculturated them to Wabash. While some aspects of rhyneship were less visible, the most visible was the wearing of the "rhynie pot", a green hat with a red bill. When approaching a member of the faculty or Senior Council, the freshman would dip his pot as a sign of respect. This tradition is carried on by the pledges of the Phi Delta Theta Fraternity. Rhyneship is continued through the Sphinx Club, a secret society made up of campus leaders, which aims to unite the campus, honor traditions, and create an atmosphere of support and prestige. Sphinx Club members don white "pots" to distinguish themselves on campus.