The aim of our notion is to create the state which the model is able to be opened and closed. Have a look at our joints, they are the simplest shape fomed likes circle which there are several holes on it. By these, the rods could be formed into the spiral column, the advantage of the form, it could be changed the form into defferent states by rotating the joint. Firstly, move the joint along the colume shape we created and then push it towards the two seperated joints we fixed on the ground. In this state, the structure will display with fan-shaped. Secondly, having rotating the joint, the middile area will be opened likes the shell movement.