  It is a pleasure to write for this 90'th anniversary volume of Journal of Low
Temperature Physics dedicated to Horst Meyer at Duke University. I was a PhD
student with Horst in the period 1975-1980, working in experimental low
temperature physics. While in Horst's group, I also did a theoretical physics
project on the side. This project in the metric geometry of thermodynamics was
motivated by my work in Horst's lab, and helped me to understand the theory of
critical phenomena, very much in play in Horst's lab. In this paper, I explain
the essence of my theory project and give a few accounts of its future
development, focussing on topics where I interacted with Horst. I pay
particular attention to the pure fluid critical point.
