Tube Chair is a minimalist design created by Barcelona-based designer Eugeni Quitllet. The tubular frame chair is available with or without arms, and is stackable. Due to the hollow nature of the frame, the chair is very light and easy to transport. Aesthetically, the flow of the chair is incredibly unique and seamless; the seat back extends downward to form the back legs, while the seat frame extend outward to form the arms.