For the release of f(x)’s fourth album, a series of graphics were produced based on the album title, “4 WALLS.” The logo released before the official release of the album shows four walls forming a room and also f(x). In another logo, four walls formed the number "4" while a box was formed for another different logo. The four walls refer to the four members of f(x) while also embracing various shapes and meanings. On the whole, it maintained the association with the exhibition held as a part of the comeback promotion, “[4 WALLS] AN EXHIBIT,” by being created to look like a catalog for an exhibition.