Humanscale Diffrient World ergonomic task chair features an innovative tri-panel mesh backrest that provides custom back and lumbar support and a lightweight design. Diffrient World is, like all of Humanscale’s products, simple, beautiful and functional. The design eliminates the need for traditional mechanisms, instead using the laws of physics and the sitter’s body weight to offer perfect recline for each individual sitter. Diffrient World offers the ultimate user-friendly sitting experience.