Couples are arranged in two regular triangular sets in the following formation with the A set aligned as normal, A1 with their backs to the music and the B set aligned as if rotated 180°, so B1 is facing the music:  

Doug Jensen has lead the Silk & Thistle class for more than the eleven years I have danced with the class. He prepares on average 50 classes a year and is always ready for whoever shows up - we have new people drop in at any time. This dance is written to honor him, his dedication, and his very special birthday this year.