"Psychotunnel", a three-dimensional whirling vortex, transported participants to an abstract virtual world. It was one of a number of virtual attractions in "The Great Sandini Circus of the CAVE™", which premiered in the Spring of 1995 at the EVE4 event, Gallery 400, Chicago IL. It has also been shown at SIGGRAPH 96 and the Ars Electronica Festival '96 in Linz, Austria.