The large roof, which is the symbol of the Jellyfish Pavilion, is made of a translucent membrane that lets in natural light while maintaining an appropriate internal temperature. It has a truss structure made up of thousands of steel beams of different lengths arranged in a triangular pattern.

The pieces of wood in the "Tree of Creation" are spread across the roof, and while safety has been carefully calculated to ensure it is safe, the edges are not tightly fastened, leaving a certain amount of wiggle room, as to let the vibrations help people feel a sense of connection with the structure.

The Jellyfish Pavilion was created based on the philosophy of “creating a ‘place,’ not a building” and that a “place is a living thing that can always change,” guided by architect KOBORI Tetsuo, who values the spirit of “co-creation,” and led by the Daiwa House Group.
The above-ground portion of the Jellyfish Pavilion has no walls, with only a large roof over a hilltop, making it a semi-outdoor space.
By climbing the spiral slope, visitors reach the top of the hill. We want to recreate here the feeling of freely playing in nature.
Like traditional Japanese homes where sliding shoji screens can transform a room from a living area to a bedroom, this space is designed to be “available,” unrestricted in purpose.

Standing beneath the large roof is the symbolic “Tree of Creation,” an iconic structure made by combining six different lengths of Yoshino cedar. Created using an algorithm inspired by the strange movements of slime molds, it has an organic, gentle undulation that feels neither spherical nor oval.