It s ok to leave the balloon inside.
How to make a ceramic sphere.
4 minute video about making a sphere from terracotta clay.
Thirty five year art education veteran gary benna s 7 minute video uses synchronized views.
Ceramic mold making techniques.
It will just burn out in the kiln or if you decide to poke holes in the sphere as part of the design you may be able to gently remove it through a hole in the clay.
Once the ball shape is formed use the pin tool to pierce the clay and pop the balloon inside.
Remember you must pierce a hole in the sphere to allow air to escape.
Jun 1 2020 explore christy johnson s board clay spheres followed by 999 people on pinterest.
If the clay is only 2 or 2 5 inches in diameter insert a needle tool into the sphere and insert it at least half way into the sphere so that the sphere is broken up in the center and no part of the sphere is more than 1 5 inches.
If one has not been left in the forming process an opening big enough to insert a hand is carved out at this point.