Furniture Design Praxis I Chair by Osayande Imarhiagbe The Praxis I office chair from Nigerian-American designer Osayande Imarhiagbe features a unified back and seat cushion atop a rigid polyurethane frame. The cushion is comprised of a memory foam upholstered in soft perforated leather, allowing for improved breathability and adaptability to multiple body types. Designed for modern offices, the Praxis I frame sits atop a 360° swivel base with a locking tilt mechanism. Available in steel or rubber, ball-bearing casters provide easy multidirectional movement across carpet and hard surfaces. A cylindrical gas lift provides easy height adjustment.