<i>Besides Case and Hart&#x27;s piece, we have a few other concrete examples of how computing could be a medium for understanding systems.</i><p>Only a few? There are a lot of them, actually. Games are starting to become these, particularly ones which encourage exploration and making, like Minecraft. I think we&#x27;re only at the beginning of our exploration of the craft of emergent sandbox worlds. We&#x27;re probably at an analogous stage in emergent sandbox worlds as the cartoon doodles found on Japanese temple beams from around 1200 years ago. One day, we&#x27;ll get to the sandbox world equivalent of &quot;The Watchmen.&quot;