We gratefully acknowledge all those involved in the development of the MorphoGraphX—Naomi Nakayama, Thierry Schuepbach, Alain Weber, Anne-Lise Routier-Kierzkowska, and Micha Hersch. We thank Daniel Kierzkowski for time series images and Cris Kuhlemeier for discussions. This work was supported by SystemX.ch, the Swiss National Science Foundation, EMBO Long-Term Fellowship to S.R., and the University of Bern.