Art was well developed in the Luba culture. Pottery, articles crafted from iron (such as axes, bows and spears), wooden staff and carvings and parts clad in sheets of copper were routinely produced. A notable artform of the Luba people was the Mwadi, where the male ancestors were represent in their female incarnations of the ancestral kings. According to scholars such as Daniel Kabozi, some of the intricate art works of the Luba people were mnemonic devices, a form of symbolic coded script to aid preserving information and recalling the history and knowledge of the Luba. The Luba people, states Mary Roberts, developed "one [of] the most complex and brilliant mnemonic systems in Africa for recording royal history, king lists, migrations, initiation esoterica and family genealogies", such as the Lukasa memory board.These artworks are now found in numerous museums of the world.