Lichen I like very much. First of all, because there are so many varieties in all sorts of colours. I’m not a lichen expert, so I’m afraid I can’t tell you which kind I took a picture of, but that’s not the point. If you observe the beauty of it, it’s really amazing. The intricacy of the plant (or actually it’s a symbiosis between fungi and algae) is quite striking. And it feels nice too.