1) The document discusses geometric signs and symbols that have been found accompanying cave paintings from the Paleolithic period in Europe dating back 25,000-40,000 years. 2) It notes that 32 distinct geometric symbols have been identified that appear repeatedly across Europe and over long time periods, indicating they may have represented a system of symbolic communication for early humans. 3) The discovery of these symbols challenges existing views of early human art and intelligence, and suggests that Paleolithic peoples had more advanced language and abstract thinking abilities than previously believed.