As a hobby, I took part in many mail art projects, which involved all sorts of media including ATCs, altered books, decos, chunky books, art books, journals and art magazines. My biggest achievement was The Home Project, a collection from contributors worldwide of over 100 ATCs on the subject of "Home".
I quite often used beeswax to suspend the elements. My beeswax collages, in particular were very popular and have been sold all over the world including New Orleans and Iceland!
