DANCE interview by OLIVIER ZAHM and ALEPH MOLINARI the sibling choreographers take a wild, nonbinary approach to dance, using prosthetics and primal movements to reflect on contemporary anxiety and the post-human condition. OLIVIER ZAHM — Let’s start with creating choreographies as siblings. Do you always work together? MARNE VAN OPSTAL — For the big creations that we do for theater work, we usually collaborate, but we also do smaller projects independently. OLIVIER ZAHM — And have you been dancing together since you were kids? You’re almost the same age, right? IMRE VAN OPSTAL — Yes. We come from a family of dancers. We have an older sister, Myrthe, and a younger sister, Xanthe. And we all dance. We started from a young age: I think I was seven, and Marne was six. We grew up dancing together, and then we split roads because he went to a ballet school, and…