Robotic design method is one of which could push the extreme of architectural design. Its precision, dynamic and controllability strengthen itself and contributes to the fine finish. But what if we reverse the procedure, utilizing the robotic technology not to fabricate the final work, but to engage with the whole procedure, and indirectly participate controlling not only the exterior form, but also attributes of the enclosure?

At the very beginning, the concept of our project was seeking the equilibrium between the inflation of the balloon and the restriction of the wires, meanwhile, having the robotic arms control the rotation so that we could research the relationship between form and attributes of the casted material, such as thickness, gloss, interior texture and so on. After the discovery of the interesting relationship between the subdivision of the surface and the ground, our concept was pushed forward to capture the gravitational stability of a rolling motion with the previous knowledge of robotic motion control. 

We started our project by a series of material tests and then decided plaster as the most desirable material for its fast-solidifying quality and durability. The four precisely identical molds are designed to be installed into the robot arm with different placements of the balloon to generate a sequence of similar objects with distinct gravitational centers. Having the robots be engaged with the motion of the mold system parametrically, we took control of flow of plaster, designing a precise position for the majority of casting material to stay so that the finished pieces would have different gravitational stabilities, yet in an unstable representation  sequence.

A detailed analysis of the object indicates different levels of of the geometric attributes. The crease out of less tension from the string gives the texture of the surface while the ones with higher tension segments the balloon into surfaces which we called foot surface and belly surface based on its different levels of curvature. The bottom of the tumbler are then chosen only out of the belly surface for its smoother and flatter geometric quality.