The cavity in the Chair is more than large enough to, for example, put blocks or cars in it.
Rocking the Chair is limited by only the bulging. This causes the rocking always safe.
In this Setup, the child can still just for example, independently on the Chair and sit down to a higher table. The fact that they are just not with the feet to the ground can makes sure they get a certain feeling with height and danger.
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Cubio

Cubio is a prototype of a child seat for children of 3-5 year. This seat includes both hollow as straight sides. The seat ensures stability and is very sturdy. The inside is hollow. The children can put their toys in the seat. They can take their seat with toys for example to family.

Jochen Verhulst
Jochen Verhulst Lo-Reninge, Belgium