Hi all, On the website of gravity waves by PhD comics: At minute 1 and 5 seconds to minute 1 minute 20 secs. "Now if the spacetime between you and me stretched or compressed, we wouldn't notice it if we had made marks on our metaphorical sheet....because these marks would also get stretched." Does this mean only for trying to measure the stretch of spacetime with a ruler? I understand that gravity waves are incredibly weak, but if the stretching was significant, things would certainly spread out as I would perceive them, it seems, and I would at least notice that objects formerly close to me are now farther away? Is this correct?