Moshé Feldenkrais as a Physicist
Feldenkrais studied at the Sorbonne and earned a degree in Applied Physics, which I think might be close to what we would call ‘engineering.’ He uses physics terms in a playful but ultimately precise way – and 'differentiation' is a good example.
Remember calculus? Differentiation in calculus is about finding the rate of change – breaking a continuous process into infinitesimally small steps to understand how the system is changing at any given moment. That's not a crazy analogy for what Feldenkrais lessons do: they build from variation to variation, each one isolating a slightly different slice of a movement to understand how it's organized, and to put you in choice about what you want to do with it.