Various map projections are available to quantify different parameters and visualize patterns of cell organization (Supplementary Movie 6). (a,b) Winkel Tripel and Fuller projections show little distortion and are best suited to visualize the speed of cell migration. (c) Angle-preserving Mercator projections were used to visualize cell flows and direction of cell movement. (d) The Bonne projection is area preserving and was therefore used to depict cell densities. (e) Cell dynamics on the spherical data were also visualized interactively in Fiji’s 3D viewer28, where the embryo can be turned to look at specific regions of interest. Insets in the top left corner depict the respective world map projections in red.