I found the &quot;gravitational crystal&quot; concept and the following part interesting:<p>&quot;But what about the three-body problem? The pictures above suggest a very different story. And indeed my guess is that the evolution of a three-body system can correspond to an arbitrarily sophisticated computation—and that with suitable initial conditions it should in fact be able, for example, to emulate any Turing machine, and thus act as a universal computer.&quot;<p>Building a complicated physical computer to simulate real-world similar to the one in <i>The Hitchhiker&#x27;s Guide to the Galaxy</i> is an interesting concept. But wouldn&#x27;t designing that computer require even greater computational power?