Cellular slime mold (Dictyostelium discoideum) cells, are put on a bacterial lawn. As individual cells, they migrate on the lawn, eating bacteria (E. coli) by phagocytosis. In mitotic phase, they stop migration, become round, and split into two daughter cells. The number of cells gradually increases. After finishing eating all bacteria, they still search for bacteria for a while. When they realize there are no bacteria, they begin a synchronous movement. Later, they aggregate each other, adhereing by side to side, end to end association, and form streams moving toward the aggregation center. They move toward the aggregation center by chemotaxis. This aggregation is a key step for multicellular morphogenesis for this organism. Frame size 640 x 480; 54 pixels = 20 micrometer; total time 1:52.77; Actual duration 12 hours. Celldance 2008, Honorable Mention Video: From Single to Communal Life