The primary function of a plinth block is to provide a transition between different architectural elements, such as the door casing and the baseboard. It adds visual interest and can enhance the overall appearance of a room by creating a more polished and finished look.

Plinth blocks are often made from wood, but they can also be crafted from other materials such as MDF (medium-density fiberboard) or polyurethane. They come in various sizes, styles, and finishes to complement different architectural styles and interior design preferences.

Overall, plinth blocks are a simple yet effective way to add architectural detail and elegance to interior spaces, particularly around doorways and baseboards.