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His process involves a series of sketches, long textual excursuses and model-making with his team.

Older readers, however, may feel like Gandalf the Grey when encountering words such as “anyways,” or an excursus into the joys of snail mail.

Especially trying is Book Six’s 400-plus page excursus into Hitler and the etiology of the Third Reich.

Following an excursus into the world of poststructuralist theory at Yale and in Paris, he switched his field to political science and received his Ph.D. from Harvard’s government department.

There are references to Twitter trolls, a gloss on Putin and dezinformatsiya, and a brief excursus on Derrida, deconstruction and postmodernism.