With the work of Ngak'chang Rinpoche, the calligraphy is not simply a brush-and-ink drawing.  Each piece carries seals and signatures, in unique combinations.  The most easily recognisable perhaps is the seal of scorpion is found in Tibetan calligraphy on the works of both Trungpa Rinpoche (see here) and some of the work of Ngak'chang Rinpoche.  Robert [...]