CHRISTO (1935-2020) Abu Dhabi Mastaba (Project for United Arab Emirates) signed, inscribed, dedicated and dated 'Christo 1978 FOR Anna New York 1986' (upper left); titled 'ABU DHABi MASTABA (PROJECT FOR United Arab Emirates)' (lower edge) graphite, charcoal, pastel and crayon on card 8 ½ x 12 ¾in. (21.6 x 32.5cm.) Executed in 1978