Something more mysterious? What is mysterious about Einstein's definition of a Frame of Reference?Yes I realize this. However it is only measurements of the surface of something more mysterious.Well, I'm glad that helped because it is the basis of Special Relativity.
I mentioned earlier how another observer could create his own Frame of Reference with totally different co-ordinates and how that shouldn't be disturbing. Do you understand this and do you agree it's nothing to be disturbed about?