I top linked the most recently published video mostly for the introductory breakdown in ternary logic equivalence, but the interview with the ternary researcher, Dr Bos, also linked in the description above includes a number of corrections and accurate description of the subject.

Yeah, definitely not a lost art or anything, as physical ternary signals already have applications in communication like high data rate interfaces. Still, would be interesting to see ternary expand into logic domains with emerging developments in TCMOS research.