Furniture is a term used to describe moveable things that are used to support human activities such as seating (e.g., stools, chairs, and sofas), dining (tables), and sleeping (e.g., beds and hammocks). Furniture can also be used to store items or to hold objects at a comfortable height for work (as horizontal surfaces above the ground, such as tables and desks) (e.g., cupboards, shelves, and drawers). Furniture is a type of ornamental art and can be a product of design. Furniture can serve a symbolic or religious purpose in addition to its functional duty. Metal, plastic, and wood are among the materials that can be used to create them. Furniture can be created with a number of woodworking joints, many of which are culturally relevant.