Just to split hairs, but one should get things accurate; The tops'l is reefed against the yard, To close reef a modern double topsail, the upper half is merely furled. No so simple the old style single sails. Most of them had three reefs, some four. The yard was lowered to the cap (or lower masthead). The sail was then gathered in fold by means of clewlines and buntlines. Next, the reef tackle was manned, both sides and the outer edges or leech being hauled to the proper reef earring. This earring was lashed to the yard arm. The reef points were tied around the sail, which was then hoisted reefed. This operation sometimes took hours of heartbreaking labor in foul weather. The above diagram shows: as in this diagram not the mast.