The approach is very similar to the one used to create the classic high  drop sculptures, where the column is created by two crater-building drops falling at a short distance one behind the other. However, to create the bubble at the foot of the column, the timing has to be exactly right: an opening of the valve of 1ms more or less can already determine whether to get a bubble or not.

Impressum    Datenschutzerklärung                                                                                             © Martin Kögl, 2017