I've encountered it two or three times. Mostly it feels like a large noodle. No kidding. Very rubbery. Ive also inspected it closely and have seen it attached directly to my head and between my shoulder blades in my back. Most of the times it was directly connected to my head. It "felt" thick. When i've looked at it closely I once saw some type of hieroglyphic symbols on it. I would say it has been more "grey". I've traced it back to my physical body laying in bed also connected at the head.