Italian design meets Dutch design in this fantastic optical illusion object. This 'filigrane interferenti' glass object represents the fascinating collaboration between two of world's most eminent glass artists. A.D. Copier, the great Dutch glass designer, and Italian glass maestro Lino Tagliapietra, were assisted by glass artist Bernard Heesen in creating this fabulous piece. It is a one-off piece designed in 1990 and manufactured at Oude Horn, Acquoy, the Netherlands. Signed by all cooperating artists and numbered at the bottom.