Metal mold with pyramidal points facing inwards and arranged regularly.
By blowing the glass into the balotòn mold, it is possible to obtain a pine cone shape that can be used for further processing steps such as e.g. the sommerso and so have a series of regular bubbles.
Credits to: Parole di vetro - Marsilio editore ISBN 88-317-7198-1
Pictures by: Bruno Carnevali
Designs by: Alessandro Lenarda