 The painting that depicts the Battle of Antietem, which Embeth  Davitz is looking at when David Wark is first introduced, depicts  (in one corner) two young girls huddling together with the words "An  Unseen Enemy" written above them. This is clearly a reference to the  D.W. Griffith (qv) film _Unseen Enemy, An (1912)_ (qv), with the  two girls depicted being Lillian Gish (qv) and  Dorothy Gish (qv). This detail can be briefly glimpsed in the  scene, but a close up of it can be seen in the Outsider Art Gallery  section of the DVD. On a side note, the initials in  D.W. Griffith (qv)s name stand for David Wark.