The New York City-based Tiffany Mills Company returns to the Flea, where it presented Blue Room last year, for the world premiere of Not then, not yet, running November 13-16 at the downtown theater. The work is a collaboration between dancer-choreographer Mills with Puerto Rican composer and multi-instrumentalist Angélica Negrón, a founding member of Balún who writes electro-acoustical music for toys, robotic instruments, accordions, ensembles, and orchestras, and Brittany-born neoclassical composer and singer Muriel Louveau; Negrón and Louveau teamed up last week with dancer-choreographer Emily Marie Pope for the improvisational Isterica at National Sawdust, where Negrón is the current artist in residence. Not then, not yet explores transitions through space and time, inspired by the early writings of Mary Wollstonecraft Shelley dealing with creation and destruction, isolation, and endings and beginnings. The evening-length piece will be performed by Mills, Pope, Jordan Morley, Kenneth Olguin, Nikolas Owens, and Mei Yamanaka, with lighting by Chris Hudacs and costumes by Pei-Chi Su. Tickets are $15-$20 except for Friday night’s benefit, which are $50 and includes a postshow reception.