Tenshinkaku was originally recorded with the intention of releasing an album under the same title, but it never materialized. Some tracks were excerpted and edited into one track as "Tenshinkaku 01" on the bonus CD "Early Computer Works" accompanying the special edition of Scene (Waystyx, 2005). This Archive Series release presents the material in its original, complete form for the first time.

The title suggests "celestial tower" - an elevated metaphor for recordings from Merzbow's digital dawn. Akita reaches skyward even as he reconfigures his foundational tools, suggesting spiritual aspiration transcending technological change. The tower rises from earth toward heaven, connecting material and immaterial realms.