“Nature” in this case means a set of six unused maximum cards from 1994, of which four appear in the scan.  All are captioned in Korean and with the scientific names of the respective foliage, which–if you would like to know–are:  Chrysosplenium sphaerospermum, Campanula cephalotes, Dianthus repens, Gentiana algida, Sedum kamtschaticum, and Trollius macropetalus.  (Why do we do this?  Two reasons:  someone might really want to know, and we need all the search engine visibility we can get for this website.)  Grade: 1