Sowei Mask - Curator's Notes with Bill Hart. Bill Hart discusses the Sowei mask of the Sande or Bondo Society of Sierra Leone. Sowei masks are perhaps the most iconic of Sierra Leonean objects to be found in museums throughout the world. The video was produced by the Reanimating Cultural Heritage project at University College London. For more information about this and other Sierra Leonean cultural traditions see www.sierraleoneheritage.org