Take a look at this - isn't it pretty? Award-winning image too.
Irish moss, or carrageen moss, is on my list of 'things to play with in the kitchen' but I haven't gotten around to it yet. Mind you, that's a long list...
It's also interesting to see all the different names for it in different languages. So far, I like 'curly gristle moss' because it sounds like a poisonous plant that might be used by the villain in a Miss Marple novel* and the Galician 'carrapucho' for the way it rolls around the mouth when you say it.
*In which case, the cook did it - of course.