Soft, cell-like blobs that hold themselves together while gliding around, splitting and merging. This is particle Lenia, from Mordvintsev and colleagues.
The original Lenia is a continuous relative of Conway's Game of Life, played out on a grid. This version has no grid at all. There are only particles, and they push and pull on one another.
Each particle exerts two influences on its neighbours: a pull that draws them in from a distance, and a shove that keeps them apart up close. Every particle drifts in whatever direction the combined push and pull points.
The balance between the two is everything. Too much pull and the whole thing collapses to a dot. Too much shove and it disperses into nothing. In the narrow band between, the particles arrange themselves into membranes and rings that stay coherent while moving. Nothing in the rules describes an organism.