4 loudspeakers on top of a pedestal playback short bits of highpitched sounds in random pattern. The speed of the playback is very high so that a flickering sound is heard by the visitor infront of the speakers.
In a narrow room 4 sheets of different metals (copper, alpaca, brass, aluminium) are mounted into the wall. 4 speakers above the heets playback the sound of scratched metal
2 by 3 - Glass object Two mirrors are mounted rectangular to each other and hung at a wall. Left and right of the mirrors 2 glasspanes stick out of the wall with photos on their inner side. When the visitor goes with the nose towards the tip of the mirrors he/she will see a 3-D image in front of a normal two-dimensional background. At the same time the visitors ears are exactly between the two loudspeakers that hang from the ceiling and he/she hears a sound in the centre of the head.