Counterpoint with the Top Down

I was taken aback when I read Steve Smith‘s review of Taneyev’s opera Oresteia in this morning’s Times with its mention of Taneyev’s textbook Convertible Counterpoint in the Strict Style. Convertible? Surely it must be Invertible? But no, that seems to be the correct title. Well, if I want to write counterpoint involving a ’57 Thunderbird, I know where to look.