 The finger boxes are also intended to be touched by multiple people at a time, promoting a shared, social, experience of perceiving the work.Several versions of the "Finger Box" exist, including one set of boxes in a briefcase (entitled "Finger Box (valise edition)") which is in the Gilbert and Lila Silverman Fluxus Collection in Detroit, and a version (included in "Fluxus I") that uses sealed envelopes that have been slit open instead of boxes.In the 2012 Japan retrospective, "Over the Rainbow once More" - a larger work is presented around the finger boxes—it is a cubic room in which the viewer/toucher enters.