Formed in 2015 by Cathy Lucas and named after Cathy's identical sister absorbed in utero, when they were both still a cluster of cells. The group was originally made up of singer Cathy Lucas (Innerspace Orchestra), drummer Valentina Magaletti (Raime, Tomaga, UUUU, Neon Neon), bassist Susumu Mukai (Zongamin, Floating Points), library music head Phil M.F.U. (Man From Uranus, Broadcast) on strange sounds, and film maker and visual artist Elliott Arndt on flute and percussion. Arndt left the group in late 2019, while Phil M.F.U. announced his departure in May 2022.