I hadn’t noticed these grasses or seaweeds before in an area where I snorkel regularly. But one day, there they were, swishing back and forth with the movement of the water. They weren’t around long, the sea floor soon being returned to its previous mix of sand, rock. and coral.
Graham's Island 
Now that is when I get seasick – that surging motion can really do me in if I watch it for too long without swimming.
LikeLiked by 1 person
Happily, I’ve rarely been seasick in my life, but I know what you mean about that kind of motion. Time to look at something different for a while.
LikeLiked by 1 person