When the Brooklyn Academy of Music opened its new Richard B. Fisher Building earlier this month, guests at the première performance were greeted by a floating plane of light. The glowing grid, composed of thirty-six bare bulbs hung precisely from the darkened ceiling above, was the artist Anthony McCall’s visual design for choreographer Jonah Bokaer’s latest work, “Eclipse,” which, in addition to inaugurating the Fisher Building, also marked the opening of the thirtieth edition of BAM’s celebrated wide-ranging Next Wave Festival. It was additionally, in a pleasant bit of serendipity, Bokaer’s thirtieth work as a choreographer. “It just crept up on us,” he laughs, “and it’s been interesting to arrive at this series of occasions.”