Petroglyphs (IMAGE) Frontiers Caption Negev petroglyphs showing abstract forms Credit Laura Rabbachin, INTK, Academy of Fine Arts, Vienna Usage Restrictions Credit must be given to the creator. License CC BY Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.