Never did it for me. Always seemed totally trivial. What else could it possibly be!? It seems like a direct simplification of Einstein (... no global time ... s

Never did it for me. Always seemed totally trivial. What else could it possibly be!? It seems like a direct simplification of Einstein (... no global time ... spatially separated locations communicate with signals ... signals propagate in finite time ... proper time is an ordering along a world line ... relative time depends on communication ... there are spacelike separations where events do not have a defined temporal order ...). I guess they had first access to the fruit tree in those days. I once spoke to Henri Gouraud after he gave a talk. He was very self-deprecating and acutely embarrassed that his name was attached to a blindingly obvious first-thing-that-comes-into-your-head shading expression-that-barely-deserves-the-name-algorithm. Sometimes that low hanging stuff gives you stomach ache.