 Bridgman’s sentiment arising out of these reflections, however, was not the familiar one of happy celebration of Einstein’s genius. He rather regretted the sorry state of physics which had necessitated Einstein’s revolution. Einstein showed what dangerous traps we could fall into by stepping into new domains with old concepts in an unreflective way. Anyone thinking in operational terms would have recognized from the start that the meaning of “distant simultaneity” was not fixed unless an operation for judging it was specified (Bridgman 1927, 10–16). In Bridgman’s view, Einstein’s revolution would never have been necessary, if classical physicists had paid operational attention to what they were doing. He thought that any future toppling of unsound structures would become unnecessary if the operational way of thinking could quietly prevent such unsound structures in the first place. Operational awareness was required if physics was not to be caught off-guard again as it had been in 1905: “We must remain aware of these joints in our conceptual structure if we hope to render unnecessary the services of the unborn Einsteins” (Bridgman 1927, 24).