I attempted abstract shaped air chambers for this silicone mold design experiment. I started with design sketch, in the sketch below, red arrows mean channels.
I used cardboard for building the mold and stencil layer, and modified the design a bit.
Circle frame substituted for the first polygon shape frame. I put more rounded air chambers so that it could keep the stability.
I focused on procedural air flow, so I made channels in order that branch out from the first air chamber.