The first product of the Habitat Division is also the first plastic chair in the world: the "K 1340" (later "K 4999") children's chair by Marco Zanuso and Richard Sapper, from 1964. The chair is innovative in the material and is designed with a new function: it serves to sit down but also to be a game tool. Through the simple stacking system of the chairs that allows different overlapping possibilities (the legs of one chair enter the backrest of another), children can transform the stacking operation into a game.

This chair is a great success, wins the Compasso d'Oro and the Gold Medal at the Milan Triennale and is included in the permanent collection of the MoMA in New York.