An interesting short article in Nova Religio contrasts perennialism and “hyperdiffusionism” in the context of understandings of the monuments left by vanished civilizations such as the Mayan and the Pharaonic. It is “The Highest Common Factor: Heterodox Archaeology and the Perennialist Milieu” by Kevin A. Whitesides, Nova Religio 22, no. 4 (May 2019): 27-43.
The term “hyperdiffusionism” was probably coined by Glyn Daniel in 1963, and denotes the widespread idea that contemporary human cultures all share a common origin in an earlier grand civilization. The difference between hyperdiffusionism and perennialism, Whiteside says, is that a hyperdiffusionist needs to show some sort of physical transmission, while a perennialist does not, as for a perennialist metaphysical knowledge is in some sense innate.
Whitesides gives three examples of approaches to ancient monuments and their civilizaitons. One, that of Augustus Le Plongeon (1826-1908), was purely hyperdiffusionist, arguing for a Mayan origin for all human wisdom and culture. Another, that of John Major Jenkins (1964-2017), was purely perennialist, arguing that the Mayans “independently tapped into the same doctrines also found in ancient Vedic and Egyptian cosmology.” A third, that of R. A. Schwaller de Lubicz (1887-1961) mixed both hyperdiffusionism and perennialism in his interpretation of Pharaonic monuments.
The contrast between perennialism and hyperdiffusionism is an interesting one, as the case of Schwaller de Lubicz is not unique: while the two understandings are logically distinct, they can easily be combined, and perennialism often contains traces of hyperdiffusionism.
Jenkins himself is also interesting. He is best known for his part in promoting the idea, widespread during 2011 and 2012, that 21 December 2012 would have major eschatological significance—an idea that apparently helped boost sales of private underground blast shelters in the US. Jenkins based his arguemnts mostly on the Mayan calendar and the idea of “galactic alignment,” but he also drew on Ananda Coomaraswamy and René Guénon, identifying 2012 as the end of the Kali Yuga, in Galactic Alignment: The Transformation of Consciousness According to Mayan, Egyptian, and Vedic Traditions (Bear & Company, 2002).