The multifunctional Platypus activity chair provides independent sitting, head and trunk support, posterior/anterior tilt-in-space, and optional rocking and mobile bases. The Platypus is the only activity chair constructed from an extremely durable high-density polyethylene that is environmentally stabilized for indoor and outdoor use. It is waterproof, easy to clean, and FDA approved for sanitary food preparation uses. The Platypus is ideal for facilities that utilize seats for multiple users because the surface is easy to disinfect and does not splinter or delaminate over time. Available in three sizes to accommodate children from approximately 1 to 9 years of age.