Krachtgever’s first version (“Invigorator”) was developed in 1993 in cooperation with students from the mechanical engineering faculty, University of Twente in Enschede, Holland. In its biggest form, built with 56 boxes and a total width of 12 metres, it was presented for the first time in Linz, Austria, September 1998 to celebrate the Golden Nica, given to the project in the category “Computer Music” of the Prix Ars Electronica, 1998.

The boxes are joined together with metal springs, both horizontally and vertically. One oscillating motor is attached to each stack. A computer varies the speed at which these motors rotate, causing countless interferences between the stimulated vibratory and resonant frequencies of the construction.

Each box contains different materials. These "rattles", varying in volume, weight and sound, possess their own resonating characteristics. When stimulated by an oscillating motor the combined vibrations from all the elements - the springs, the boxes, the various rattles in the boxes, etc. - produce an extraordinarily complex whole.