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One of its two big monuments, “Complex One,” the very first segment of “City” that Heizer built, can bring to mind an immense mastaba or altar.

If the Middle East mastaba never sees the light of day, the Arc de Triomphe will most likely end up being Christo’s last hurrah.

Another, a mastaba, or flat-topped pyramid, made of more than 300,000 oil drums, was to be built in Abu Dhabi as Christo’s only permanent large-scale work.

The Mastaba is part of the summer program of the Serpentine Galleries, and it’s paired with an exhibition of sculptures, drawings and collages focusing on Christo’s work with barrels and with the mastaba shape.

He designed a Texas mastaba in 1975, for example, and is devising plans to build a permanent one in Abu Dhabi, which he says will be the largest art structure in the world.