Art is a defining characteristics of humans and there is evidence for a relationship between creativity and language. The earliest evidence of art was shell engravings made by "Homo erectus" 300,000 years before humans evolved. Human art existed at least 75,000 years ago, with jewellery and drawings found in caves in South Africa. There are various hypotheses as to why humans have adapted to the arts. These include allowing them to better problem solve issues, providing a means to control or influence other humans, encouraging cooperation and contribution within a society or increasing the chance of attracting a potential mate. The use of imagination developed through art, combined with logic may have given early humans an evolutionary advantage.