The Hokki stool was designed as a flexible, physical learning aid to counter traditional views that educational seating should be rigid, without any form for free movement. With supporting research suggesting that stillness of the body for long periods can actually inhibit concentration, the convex base encourages the body to move in all directions leading to healthier sitting, reduced tension and mental fatigue. The polypropylene body is highly durable but also very light. The thermoplastic elastomer soft base padding prevents slipping on hard, polished floors but facilitates a wide range of movement whilst seated. The polyethylene foam sitting surface ensures increased safety for the child when seated. The hard plastic parts are fastened to each other with screws, whilst the sitting surface is glued on and the soft base padding is bonded in a two-component process with PP. The undulating seating edge is easy to grip, prevents the user from slipping off and enables stacking when not in use.