The gallery’s fantastic and far-out four-part summer video art series concludes with a program of works by Richard Serra (1973), Hannah Wilke (1974), Walter de Maria (1969), and Chris Burden (1980). Each of these artists was equally or even primarily known as sculptors with deep connectivity to their materials — Serra’s steel, de Maria’s lightning rods, Wilke’s ceramics and bronze, Burden’s vessels and later lampposts. Yet in these videos they each take the opportunity to explore their capacity for performative focus and more ethereal conceptualism. Gagosian online through August 3; gagosian.com