The perfect pitch skill I admire the most is being able to count cycles/recognize/sing pitches by frequency and/or sing various types of temperament. Recently

The perfect pitch skill I admire the most is being able to count cycles/recognize/sing pitches by frequency and/or sing various types of temperament. Recently I've become more irritated by the way pianos seem to be tuned, and fascinated by alternative temperaments that are designed to balance playing in multiple keys vs. a more pleasant sound. It's also interesting to hear (and play) baroque instruments (for example) which differentiate between sharp and flat notes. I think one reason I enjoy choral music is that choirs can adapt their tuning dynamically. I have also tried music apps with dynamic temperament and they are interesting.