The Paleolithic Period is an ancient cultural stage of human technological development, characterized by the creation and use of rudimentary chipped stone tools. These included simple pebble tools (rock shaped by the pounding of another stone to produce tools with a serrated crest that served as a chopping blade), hand adzes (tools shaped from a block of stone to create a rounded butt and a single-bevel straight or curved cutting edge), stone scrapers, cleavers, and points. Such tools were also made of bone and wood. The Paleolithic Period was also characterized by the manufacture of small sculptures (e.g., carved stone statuettes of women, clay figurines of animals, and other bone and ivory carvings) and paintings, incised designs, and reliefs on cave walls.