Composed at the commission of Mitsuko Kado, the piece was premiered at her recital and dedicated to her. It consists of seven interrelated bagatelle movements. The performance order is not fixed, and individual movements can also be extracted to form several short piano pieces.

• The connection of Movements 1 and 2 forms 'Flash Organ c'.
• Movements 5, 6, and 7 in the latter half form 'Three Deployments'.
• Movement 7 alone forms 'Necklace'.

Each movement, like a mobile, maintains its interconnections while floating on the temporal axis. For example, Movement 2 is a 'double' of Movement 1, and a thematic recapitulation occurs at the conclusion of Movement 7, among other instances. The title of the piece stems from the way musical ideas drawn from different systems are subtly embedded within the musical ideas of a certain system in each movement. This was inspired by Roland Barthes' wordplay: 'Pleasure is inexpressible (spoken within), forbidden (spoken between)'—what is forbidden is not spoken outside.

The secret interplay within the piece is that two significant numerical sequences, which constitute the thematic intervals and rhythms of this work, represent the average per capita deficit of the Japanese government and the average per capita tax for the fiscal year 1996. These sequences are conveyed to the audience only as relatively pleasant sounds. Movement 3 carries the allegory of 'Embodiment of Contradiction', Movement 4 'Loophole', and the final Movement 7, 'Necklace', carries the allegory of 'Something that chokes'.

However, these allegories must remain concealed; the surface of this music must be innocent and light. The entire piece is approximately 13 minutes long.