For example, in the use of reading or listening, we often talk about intensive and extensive input.
- Extensive input means reading or listening to a lot.
- Intensive input is reading or listening closely and carefully, perhaps going back over material to get a lot of detail.
But once you stop thinking very carefully, most people start talking about the two things as though they were truly opposite. Why? Because whoever chose the terminology wanted two names that looked like a set, but inadvertantly made them look like opposites.
(Of course, this is just an extreme example of the problem of counterintuitive grammatical terminology, such as "regular" in the earlier article).