Louise Nevelson's "Black Cryptic XII" (1984) is a small sculptural work measuring approximately 8.75 by 7.25 by 2.75 inches, exemplifying her signature assemblage technique of combining found wooden objects into unified compositions. The work's monochromatic black finish, which Nevelson famously adopted in the 1950s, creates a unified visual field that obscures the individual origins of the component materials while emphasizing form and shadow. This compact piece demonstrates Nevelson's enduring exploration of spatial relationships and architectural possibilities through the transformation of everyday wooden remnants into contemplative abstract forms.