In 2003 we were hired by ITAIPU, the largest Hydroelectric Dam in the world, owned by Brazil and Paraguay, to renovate their old museum. We designed a new museum with a multimedia-based story-line. We wanted to meet the interest of international visitors, while serving at the same time the local Guarani Indian culture. We invited the Guarani community of ?Acaray-mi? to be part of the team. Working with that native community of Paraguay changed our view of multimedia in a cross- cultural perspective.