Our material is MDF and PVC flexible,  for the other 2 excises we used MDF only, so this time we wanted to do something different. We started from thinking what is the biggest difference between these two material.  Well, one is hard, and the other is soft, and can be bent. So we decided to use this property, and tried to form a sphere. What we did is cutting a sheet, and then it could be stretched, then became a semi-sphere. Then we used the joints we printed to connect 2 semi-sphere. To provide the force to maintain the shape, we made a another bigger joint to hold a stick in the middle.