Sign -

: This paper analyzes prehistoric cave markings across Europe. Instead of just looking at animal drawings, researchers focused on geometric "signs"—dots, lines, and triangles—that appear repeatedly across different caves.

3. Comparing Visual vs. Spoken Language (Psychology/Linguistics) : This paper analyzes prehistoric cave markings across

: It suggests that early humans had a shared, intentional system of graphic communication long before formal writing systems like cuneiform existed. You can read the full study at PNAS . Comparing Visual vs

: This is a foundational text for semiotics (the study of signs and symbols). Peirce breaks down how a sign works through a three-part structure: the sign itself, the object it represents, and the "interpretant" (how we understand it). : This is a foundational text for semiotics

: It explains why a word or image isn't just a thing—it's a tool for meaning that relies entirely on the observer's mind. You can explore a breakdown of his theories at the Stanford Encyclopedia of Philosophy . 2. The Evolution of Human Communication (Archaeology)