I was wondering if anyone knew of any invisible monuments or invisible art
like Jochen Gerz's - "2146 stones - Monument Against Racism." By night, Gerz
and his students lifted cobble stones in small batches, replacing them with
fakes while the real ones were inscribed with the names of cemeteries, to a
total of 2146. The square was named the "Square of the Invisible Monument."
Does anyone know of any other monument or art work that is like this?