Ancient Ostrich Eggshell Engravings Reveal Early Human Cognitive Organization
Ostrich eggshell fragments discovered across southern Africa, dating back approximately 60,000 years, feature intricate geometric engravings. A recent study analyzing these markings suggests that early humans possessed a structured, geometric way of thinking, indicating a significant level of cognitive organization.
Discovery and Context
Ostrich eggshell fragments engraved with geometric patterns have been found at various sites in southern Africa, including two shelter sites in South Africa and a cave site in southern Namibia. Specific locations mentioned include Diepkloof, Klipdrift, and Apollo 11. These fragments date back approximately 60,000 years and were initially described in 2010. It is believed that these shells were utilized as water containers by early foragers, a practice that continues in some regions today.
Research Methodology
Researchers from Italy conducted an analysis of the spatial arrangement of markings on 112 engraved ostrich eggshell fragments. Their examination involved nearly 1,300 lines etched onto these surviving pieces. The objective was to understand the underlying principles of the designs.
Key Findings
The analysis revealed that the engravings feature various geometric designs, including grids, diamonds, parallel lines, right angles, rhombuses, hatched bands, and complex cross-hatching.
A significant finding was that over 80 percent of the etchings displayed coherent spatial regularities. These regularities included:
- Parallelism
- Right angles (also referred to as orthogonal junctions)
- Repetitions of lines and patterns
- Repeated sequences
- Grid systems
This level of organization suggests intentionality and systematic thought in their creation, rather than random markings. The researchers proposed that the makers exhibited cognitive operations such as rotation, translation, and embedding, allowing them to transform simple lines into diverse and hierarchical creations.
Interpretations and Significance
The study's authors interpret these findings as evidence of a high level of cognitive organization in early humans.
Silvia Ferrara, an archaeologist at the University of Bologna and senior author of the study, described the patterns as an "embryonic visual grammar," indicating a "surprisingly structured, geometric way of thinking."
Valentina Decembrini, the study's first author, stated that Homo sapiens 60,000 years ago demonstrated a "remarkable ability to organise visual space according to abstract principles."
These results are considered to support the concept of a cognitive foundation necessary for the emergence of abstract thought. While the deeper meaning of these specific designs remains undetermined, the research highlights a progression in the evolution of human thinking and contributes to the understanding of the human mind's development. The findings were published in the journal PLOS One.