We designed “ext.”, creative furniture that can be “switched” to suit various work styles. “ext.” is a furniture series consisting of three items: a desk, chair, and shelf. By combining these pieces, it allows for flexible extension to accommodate various organizational needs, from individual work to group meetings. Each piece of furniture can be easily attached or detached from the frame using uniquely designed clip joints, without the need for tools. The ability to easily change the height and shape enables adaptation to different work styles without the need to replace the furniture.