The children were trapped inside by being attracted to the forbidden “fruit” of Architectural Pleasure.  One can only escape from Architecture by Eating.
Sugarcubes define spac boundaries and are used as a sustainable structural element.

Eating here is about literally eating an archetype of Architecture, a hut transformed into a prison.

The focus is reversed; the centre shifts to the limit. Their pockets become fatter and fatter as they stuffed strawberr bonbons, sherbet suckers and soft and slimy gumm sweets into them. Satisfied with what they had and proud they began to approach the way to freedom.