Rotating disk clusters. a. Trajectory of a cluster turning from a comet-like cluster to a rotating disk. Colors indicate the positions of the cluster at hours 21 (cyan) and 60 (magenta). Photographs show only the colony profile at hour 60, and the arrowhead indicates the resulting rotating disk. For more details, see Movie S6, which was extracted from Movie S1. b. Time course of changes in velocity and size of the cluster shown in panel a. Color bar on the horizontal axis is the same as shown in panel a. c. Movement and morphology of a rotating disk cluster within a period of 10 min. The video is provided in Movie S3. d. PIV analysis of the movement of the rotating disk cluster with confocal images of autofluorescent cells. Arrows indicate the result of PIV analysis (velocity). The video is provided in Movie S8. e. Correlation between the distance from the center of the rotating disk and the magnitude (velocity) of the PIV analysis. Detailed spatial distribution is shown in Fig. S6.