"punching ball" balloons
This is a resonator made from a so-called "punching ball" toy balloon. These balloons in larger inflated states get almost perfectly spherical, and at their upper end they have a knot mounted rubber band (not visible here), originally intended to be bounced around on it as a children toy.But much more exciting is, that they are capable to generate a great variety of interesting sounds, which makes them perfectly suited for resonaKampaña. E.g. on the rubber band can be played in a bass guitar like way, and very fascinating is that even down to the 1st (!) operating range they are still capable to produce interesting resonant sounds, though they don't need to be driven into ranges those would be strenuous for their fragile material to make resonaKampaña work on them.
The fanfold- like "dome" construction of these resonators gives their
membrane a rich and pretty looking fine structure of lines and zones of
varying thickness, those enable it to process vibrations in many complex
ways.
