'UBMD' (2002-present) by Margaret Morgan is a series of untitled breast milk drawings rendered in pencil, gouache and human breast milk. The drawings combine two representational systems, the indexical and the mimetic, to appropriate Rosalind Krauss' terms on photography: Milk squirted directly from the artist's breast leaves a dark trace of lines, drips and splashes, a direct record of the action, an index no less immediate than the action of light on a photosensitive surface.