AQUATICS  Henry Horenstein (*1947) has been a popular figure and teacher in American photography for a long time, spreading his influence to a myriad of admirers and practitioners of the art, including Nan Goldin, for example, who was one of his students. Among his teachers were also the master photographers Harry Callahan and Aaron Siskind.  Since the 1970’s he has been teaching at the famous Rhode Island School of Design.  His curriculum vita documents more than 30 books and countless exhibitions in museums and galleries at home and abroad.  Describing his animal