Text description provided by the architects. Our design procedure is to expand a occasional "Coincidence". "Coincidence" this time is【cliff ground】 and 【the guitar】(client is the guitarist) The site is the cliff ground with the vertical interval of 3m. 【Place above】/【place below】 was allotted to 【real volume】/【fictional volume】. 【Real volume】 is made of galbarium plates with 20.000 stainless steel bolts. On the othere hand, 【Fictional volume】 is surrounded by transparent glass walls.