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.
Sebagai saksi perjalanan mereka, mereka meninggalkan pahatan dan lukisan misterius, seperti gambar manusia, segitiga, dan zig-zag ini di gua Ojo Guareña di Spanyol.