Children shouldn’t be constrained in a closed box. On a site that is surrounded with water and hills, designing an enclosed building would have been limiting the experience of a children museum. For this reason, a 3-dimensional grid was created to blend the boundary between interior and exterior, extend the museum activity to the outdoor and bring the nature and air indoor. The grid was used in various scales, from the building frame to exhibition shelves, and was filled with glass panels and solid masses to create different types of public spaces, as well as enclosed private spaces. The transparency of the steel frame, acting both as a facade as well as a secondary structure, was used to bring daylight in and create an open atmosphere within the museum.