 Keen explained that the square ring was of “mechanical history.” With the ropes used in the 1930s, a square ring was needed because the ropes had to be anchored by posts.With the ropes gone from collegiate wrestling, Keen concluded it was time to free the sport of the squared ring.Keen also teamed with Michigan Track Coach, Don Canham, in 1952 to produce the first film techniques for coaches in wrestling; the films were marketed by Canham's School-Tech, Inc. in 1954.