To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie 1 Reorientation of Chlamydomonas turning from downwards to upwards. The shape effect of flagella is more important than bottom-heaviness on passive gravitactic orientation in Chlamydomonas reinhardtii Azusa Kage, Toshihiro Omori, Kenji Kikuchi, and Takuji Ishikawa Journal of Experimental Biology 2020. 223:None-None; doi: 10.1242/jeb.205989 Download Original Video