To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie 1. The diamond type arrangement observed in the 4-cell stage of the C. elegans embryo. The embryo is identical to that shown in Fig. 2A, and Fig. S1 in Yamamoto and Kimura (2017). The extra-embryonic space and the local contour are crucial geometric constraints regulating cell arrangement Sungrim Seirin-Lee, Kazunori Yamamoto, and Akatsuki Kimura Development 2022. 149:None-None; doi: 10.1242/dev.200401 Download Original Video