Sign -

Humans 40,000 y ago developed a system of conventional signs

: 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. Humans 40,000 y ago developed a system of

: 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) researchers focused on geometric "signs"—dots