Tilman Hecker, a resident artist at the Watermill Center, will present “Midnight,” a work in progress for video, light, and three performers, Saturday at 8 p.m. Though the project is inspired by Mozart’s musical scores, his music is not part of the event. Instead, the artists will visualize Mozart’s music through four elements: video, lighting, and the movement of two performers, which correspond to piano, voice, winds, and strings in Mozart’s compositions.