But ultimately that's still an observation of a measurement; any 'truth' is necessarily abstracted into an internal ontological representation of that observation. One person's understanding of the measurement of the speed of light may absolutely be different than the next. These represntations may converge more strongly than, say, something more ephemerate like the human condition, but regression towards shared observation via scientific processes (or otherwise) doesn't have to imply truth. Ultimately the definition of 'truth' dictates the extent of it's subjectivity, so this discussion is necessarily pedantic. I'm not well enough studied in ontological theory to have a horse in the race, but I don't know that the conclusions of relativistic experiments are enough to indicate universality of experiential truth.
