When we interact with others, we coordinate our thoughts, intentions and behavior through back-and-forth exchange: from exchanging casual smiles on the U-bahn to deep philosophical discussions about the state of the world. But why are we compelled to do things together? The answer, is almost certainly not simply only to achieve things we can do together, as there is a great deal we can do alone. The answer perhaps lies in how we do things together. In the examples of team sports, dance or group music making, we see richer ways in which individuals temporally coordinate and adapt to one another over longer periods of time. One individual might slow down their actions. Their partners in turn will adapt their behaviour to a greater or lesser extent.