Charms (IMAGE) University of Maryland Caption In West African practice, placing metal and pointed objects at the doorway helps deter harmful spirits from entering. These were found buried at the entrance to the slave quarters, until now known only as a potting shed -- its most recent use. Credit UMD Usage Restrictions None License Licensed content 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.