Earliest geometries: A cognitive investigation of Howiesons Poort engraved ostrich eggshells Author:Valentina Decembrini, Ludovica Ottaviano, Mattia Cartolano, Enza Elena Spinapolice, and Silvia FerraraPublication type: Journal ArticleYear: 2026Journal/Series title: PLOS OneURL: https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0338509Humans Sketched Oddly Precise Geometric Patterns Onto Ostrich Eggs 60,000 Years Ago Research: Anthropology
