Dopplereffekt disappeared for a few years, as Donald concentrated on other ventures such as Japanese Telecom and Arpanet. When the project returned with 2003's Linear Accelerator, Dopplereffekt had abandoned its sense of humor, instead concentrating on scientifically themed deep space excursions. Calabi Yau Space followed on Aphex Twin's Rephlex label in 2007, further exploring themes such as physics and cosmology. Dopplereffekt members Donald and To Nhan Le Thi performed more frequently, but no new releases appeared until 2013's Tetrahymena EP, released by Berlin label Leisure System. The group collaborated with Visonia (Chilean producer Nicolas Estany) on the single "Die Reisen," released in early 2014 by Last Known Trajectory. Also that year, Leisure System released Hypnagogia, Dopplereffekt's split 12" with Objekt, which received much acclaim from the dance music press. Cellular Automata, Dopplereffekt's long-awaited third proper full-length, arrived on Leisure System in 2017. An EP titled Athanatos followed in 2018. ~ Paul Simpson, Rovi