a cheerful librarian carefully places colorful books onto different horizontal wooden surfaces mounted on the wall. She reaches up to arrange novels on the higher surfaces while keeping reference materials on the lower ones. As she organizes each section, the flat wooden platforms become neatly filled with different categories of items. Her young assistant hands her more books from a cart below, pointing to specific horizontal surfaces where each book should go. The wooden platforms create perfect display and storage spaces at various heights throughout the room. multiple flat horizontal surfaces being used for storing and displaying items