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It argues that our relatively high-level ability to communicate shared intentions is a uniquely human attribute that has helped us to develop languages. Conversely, a low level of it has restricted language development in animals. It also simulates how cultural transmission effects our intention sharing abilities.
And since we are producing an Intention Sharing platform this obviously struck a chord in me. Human communication, intention sharing, and coordination skills have resulted in our current world dominance (if you ignore those cockroaches who will most likely out survive us). But, at the same time, a huge chunk of the world's problems arise from a failure to communicate and coordinate intentions.
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* (image sources unknown – I did try to trace them back. Let me know if they are yours)