Oh, I mean they crop up in lots and lots of applications, because their structure is so simple to satisfy. Not that they would crop up, if you somehow randomly

Oh, I mean they crop up in lots and lots of applications, because their structure is so simple to satisfy. Not that they would crop up, if you somehow randomly generated mathematical structure. The real world, and especially the part of the real world that people engage with, seems to have a lot of simple structures.