Saintbertholdt: "instead of sailcloth fabric, gravitational waves move through a “fabric” of space. Einstein called this fabric the “space-time continuum.
Of course Einstein was an avid sailor, both in berlin and off New Jersey/York. He would be surprised that his first gravity waves discovered were actually rips in his sail's 4D fabric, or rather the merger of two black holes into one. He would have more respect for American sail makers/researchers too. His US boat, was named "Tinnef" a name that would bring a smile to anybody that shared his 1930 berlin dialect. from "tinny," thinly made.