The exhibition (Reliquaire en chantier) offers the opportunity to discover the secrets of a medieval relic. The reliquary of St. Mauritius is one of the most valuable treasures of the abbey. After centuries of use and the ravages of time, a thorough restoration is necessary. It started in 2017, and the upper (silver) layers, many gems and other materials were removed. The exhibition shows the treasure in all its parts and the collaboration between experts in history, iconography, dendrochronology and other sciences. In this way, the biography of this treasure can be illustrated even more clearly concerning the (art) history of the abbey. The abbey was founded in 516 and has been in use without interruption ever since.