In the untitled work (1999), a glass plate on the floor serves as a base for objects that allude to duality: transparency and opacity, lightness and weight, delicacy and brutality. Glass goblets and containers, intact or broken, are combined with pieces of sea sponge and pieces of iron and lead. One of these is a braid, whose cables connect all the elements. In this work, Tunga takes the term [missing word - likely "transparency"] as a reference. Nigredo, which in Latin means dark, and was adopted by alchemists to designate the first state of alchemy, spiritual death, that is, decomposition or putrefaction.

The end result is a complex that resembles scientific experiments on energy conduction.