Formed in 2015 by Cathy Lucas and and named after Cathy's identical sister absorbed in utero, when they were both still a cluster of cells. The group is 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.

In 2016 they released their debut album Choose Your Own Adventure on the Soundway label.