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Egyptologist Joshua Roberson reconstructs the feature as a palimpsest created when Ramesses II's inscription was carved over a plaster-filled inscription of Seti I; loss of fill exposes both layers at once.
Contextualizes
The University of Memphis records Roberson's 2016 specialist publication specifically on the 'Abydos Helicopter,' confirming the Egyptological source and its palimpsest analysis.