signed and inscribed “Thanks Anne” lower center verso in black ink

signed and titled center verso in brown ink stamped with A.R.T.A stop center verso in black ink provenance: from the Grace Hertlein Collection and Archives

signed and titled center verso in black ink stamped with A.R.T.A stop center verso in black ink provenance: from the Grace Hertlein Collection and Archives

signed and titled center verso in brown ink stamped with A.R.T.A stop center verso in black ink provenance: from the Grace Hertlein Collection and Archives

titled verso on artist’s label hardware: CRT software: Raster provenance: from the Grace Hertlein Collection and Archives

artist’s studio stamp with title, date, and signature verso center in black ink provenance: from the Grace Hertlein Collection and Archives

artist’s studio stamp with title, date, and signature verso center in black ink provenance: from the Grace Hertlein Collection and Archives

signed, titled, and dated verso in graphite English translation of German text inscribed on verso: “Boundary changes due to aperture variation” provenance: from the Grace Hertlein Collection and Archives

signed, titled, and dated verso in graphite English translation of German text inscribed on verso: “Changes in the boundaries of two squares of equal height by shifting the location of the rear square” provenance: from the Grace Hertlein Collection and Archives

titled verso on artist’s label hardware: CRT software: Raster provenance: from the Grace Hertlein Collection and Archives

titled upper left verso in black ink hardware: CRT and Evans & Sutherland Frame Buffer System provenance: from the Grace Hertlein Collection and Archives