Furniture Design Span Rocking Stool by Jeffrey Koffman Span is a seating concept that merges the principles of a rocking horse with the simplicity of a stool. Light weight and compact, Span combines utility and function in a small envelope. As the modern workplace evolves into a more collaborative teaming environment, small modular seating elements become imperative. Span was conceived to address this specific transformation but as the concept evolved, its application in schools, dorm rooms, hotels, and waiting rooms became evident. Span is a cost effective seating element that provides intelligent storage and creates value in an emerging market.