Church of The Holy Trinity at Ave Jean Mermoz in Lyon was built in the 1960s. Both in terms of architecture and the interior finishing, the building is characterized by aesthetic and formal restraint. The church was designed on a square plan, which was functionally divided into nine smaller also square fields. The focal point is the chancel with a diamond-shaped skylight above it, symbolizing divine perfection and light. The solutions included in the interior design of the church interiors emphasize the sacredness of the place while respecting its original decor. All the proposed solutions are aimed at maintaining the existing style and harmony.