The image presented is not a building facade or architectural detail, but rather a decorative ceramic tile in the Art Nouveau style. The tile features a stylized floral motif with a central blue-violet flower and two smaller flowers on the sides, complemented by elegant green leaves and stems.
Although this is not an architectural element in the traditional sense, such decorative tiles were often used in the design of facades and interiors during the Art Nouveau period (late 19th - early 20th century). Such decorative elements could be placed in the design of portals, bay windows, windowsills, or as decorative inserts on the facade.
In modern facade design, similar decorative elements can be used to create accents or thematic inserts, especially when designing a house in Art Nouveau or eclectic style. Ceramic panels or individual tiles with floral motifs can organically fit into the design of the entrance group, emphasize architectural details, or create unique visual accents on the facade.