This is awesome: https://www.cnn.com/2023/11/30/world/li ... index.html
These researchers were able to condition human tracheal cells to form balls with cilia on the outside. These balls were motile, and the article seems to say that differently shaped ones had different motion behaviors. What's more, when put in an environment with damaged human neurons, they glommed onto the neurons and started repairing the damage (though the article says the researchers don't yet know the mechanism).