Rope With Four Ends by Mr Magic (red - cotton)

NOTE:  This is new.  It came from a magician's estate.  

Display two pieces of rope. Stretch your hands as the two pieces magically form into one large rope. Next, show the rope has magically changed to have three ends, then suddenly has four. Finally, a knot is tied in the middle and the rope is tossed into the air. While in the air, the knot has multiplied into three knots.