english: As witness to their passage, they left behind mysterious engravings and paintings, like this panel of humans, triangles and zigzags from Ojo Guareña in Spain.
non_english: Kao svedoke svog prolaska, za sobom su ostavili misteriozne gravure i slike, kao što je ovaj prikaz ljudi, trouglova i cik-cak oblika iz pećine Oho Huarenja u Španiji.