It's as though we have walked out to the very last among the thousands of volcanic rock columns that comprise the Giant's Causeway, and the sea is now lapping round our ankles. But though we probably shouldn't place undue pressure on the stone beneath our feet, it might just support a final expansion of perspective on a horse that truly measured up to his naming for a geological phenomenon. For the scintillating debut of Classic Causeway on the main track at Saratoga a couple of weeks ago permits us to...