I wanted to make a safe and protected place for the autistic person. If the family have guests or someone is visiting this can be overwhelming for the autistic person. As well as the furniture may me moved and changes. As an autistic person don't like changes, and can feel insecure in changed environment I wanted to make a space where he can feel safe but still are able to interact with the rest of the people in the room if he wants to.
The shelves is because the autistic person normally like to have everything organised, and between the sofa and the shelves we have the paintable wall from the microarchitecture.