Bacterial colony

What you're seeing

1. A loose chain of translucent teal cells, each with a dark round centre, lies across a pale teal-grey background.
2. The chain drifts and turns slowly, and several cells show pinched outlines, as if partly split into two, three or four lobes.
3. Later frames show the chain in new arrangements, with pairs and small clusters of cells joined by thin membranes, and single cells drifting apart at the right.