Joan Mitchell, Untitled, 1992.  Pastel on paper, 74.9 x 55.2 cm (29 1/2 x 21 3/4 in).

Joan Mitchell, Untitled, 1992.  Pastel on paper, 74.9 x 55.2 cm (29 1/2 x 21 3/4 in).

(Source: joanmitchellfoundation.org)