Kite surfers aloft at Cronulla     You gaze up from The Esplanade at a spectacle wilder than any carnival ride, the wonder of kite surfers rushing by at breakneck speed, escaping skyward from their worries and Ozone Street lassitude.   They rise over the whale’s road without ennui in the thrill of the moment, eavesdropping on those echoes from the deep, the breaching spume of a humpback appearing in the distance like a white plume.   Call it a mystical ride high above the waves on the cosmic geometry of joy, one derived without calculus, the energy multiplied by…