Aspects of American popular culture and the depiction of
various social milieus have provided his work's repeatedly occurring and predominant imagery, which encompasses painting, photography, sculpture, and installation.
There is limited and inconclusive evidence for
various combinations of discrete trial training, incidental teaching, pivotal response training, and
milieu teaching [55], [57], [78], [121], and some evidence that pivotal response training may be beneficial for communication and
social interaction [58], [63], [113].