The document discusses the geometric patterns and shapes of artifacts from different pre-Hispanic Mexican cultures. It describes Zapotec artifacts as being circular, rectangular, or oval in shape. Aztec artifacts are described as being round, triangular, square, or rectangular. Totonac artifacts are said to be rectangular and ovular in shape. Mayan artifacts are characterized as pyramidal and triangular stone structures. Olmec artifacts are detailed as being made from fired clay with similar lines.