Alastair Macaulay for The New York Times

BERKELEY, Calif. — Mark Morris has often proved the most life-enhancingly musical choreographer alive. In his latest work, the two-act “Acis and Galatea,” you can’t miss multiple layers of his musicality, but sometimes they tug in opposite directions.  Its premiere here was on Friday; it will be seen in Boston in May and at New York’s Mostly Mozart Festival in August.