Poul Kjaerholm PK 9 chair:
The PK9 chair, AKA the "Tulip Chair", was designed in 1961 by Danish wunderkind Poul Kjaerholm. It's still in production today and available in various types of leather thanks to the manufacturer Fritz Hansen (which happens to be the official licensers of a plethora of my favorite mid-century Scandinavian furniture. How I wish I was an executive there.)
The seat seems to be perched so delicately— almost awkwardly— above the legs that it sort of makes me laugh.