Wow, thanks for feedback. I've rephrased some of the sentences.

You remarks make me think a talk I had we a colleague. I thought for a very long time that univers were actually like what we describ through equation. There were really some "energy gauge", "mass", "speed", etc... until this colleague told me "That's just a model, it's not the reallity. it gives good results in its field of application, but it will always be just an approximation."