Tempted to bring in the fact that classic Mac used colons as a path separator. As TFA says it wasn't clear yet that unix would be so dominant. Also, a lot of t

Tempted to bring in the fact that classic Mac used colons as a path separator. As TFA says it wasn't clear yet that unix would be so dominant. Also, a lot of these systems were introducing the concept of directories for the first time in their history. That's how old we're talking. That directories are novel to some people at that point.