This original artwork by Mark Tobey is a Monotype with tempera, heightened with tempera on paper. Signed Tobey lower right Signed Mark Tobey with the remark GOOD! on the back. Provenance: Henze Ketterer Gallery Certificate of authenticity by the Committee Mark Tobey. Mark Tobey is one of the most important American painters of the XX century. One of the ''mystical painters'', he can be also considered the pioneer of artistic ferment that culminated in the second part of the century in the Abstract Expressionism.