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As I now have a desktop computer, I've revisited a few games which ran on my Macbook Pro but tended to send the fans into overdrive. They don't cause the same issues on the iMac, which has less memory and a slightly older (and slower) CPU than the portable machine, but one has the peculiar habit of crashing.
The one which doesn't crash is the slightly old title, Civilization V. I don't so much play the game as much as I just fiddle around with it in multiplayer hot seat mode. It's a fun little time waster but only recently did I notice an odd feature; the Great Wall of China is not a stationary. The following screen shots demonstrate its every changing shape.
Here it is in one game while in its construction phase;
Here it is a number of turns after its completion. Note that it has expanded to grab more territory;
And here it is a few hundred years later in game time;
I'm not sure if this is the way it's supposed to work or if it's a strange form of commentary on the real world...