HabiCave is a cave of sensory stimuli that projects calm and invigorates the senses thus promoting the well-being and happiness of primary school children. Here the child can retreat to first unwind in a peaceful space and then recharge her “batteries” with exciting sensory impressions. Sound and light effects, movements and a super cosy ball bed are some of the elements that stimulate the children in the sustainable sensory cave. The cave is made of felt, developed from recycled plastic from the world’s oceans. Field studies, experiments, dementia research and psychiatry have been incorporated into the designer’s development process. In the primary school of today the children are bombarded with noise and turmoil, and their well-being is in free fall, not least after the most recent primary school reform. The cave offers a sustainable source of tranquillity and well-being.