Trumpet (or German ‚Trompete‘, sound cylinder made of cardboard), self-luminous balls, luminous plate, drums: To test the degree of density of occurring spirit phenomena, certain objects are traditionally used to gradually create illuminated conditions. If one asks the spirits at the beginning to play instruments in the dark, like the tambourine or drums, more and more strongly shining and ever larger objects follow, which make it possible for the observer to recognize in the backlight first materialized forms.
