There is an IKEA bookshelf that can be assembled by itself and can be changed. What's it called?

American jokes? IKEA is a popular brand in America. Because the products it sells are cheap and the workmanship is poor, it has become the object of ridicule by Americans. Because most furniture needs to be transported and assembled by consumers themselves, it is inevitable to spell out parallelogram cabinets and bookshelves. I personally once bought a field-shaped storage cabinet, but after spelling it according to the instructions, it became the shape of "you".