The paper decoration that can be put on walls is often called a "poster." Posters can come in a variety of sizes, designs, and materials, but they are typically made of paper or other thin materials and are designed to be hung on walls using adhesive or other mounting methods. Posters can be used for decorative purposes or to convey information or messages to viewers. They are commonly used in homes, offices, classrooms, and other settings where people gather and want to add visual interest to a space.