Keisuke Oka was born in Fukuoka Prefecture in 1965 and currently lives in Tokyo Prefecture.
He attended Takayama Architecture Seminar School for the first time in 1988 (which he currently manages). He moved to Tokyo in 1989, and worked at various construction sites, gaining experience of different operations. Learning dance under the Butoh dancer Yukio Waguri, Oka performed as a dancer and he also ran Oka Gallery in Koenji. He started constructing a building by himself, calling it “Arimaston Building” – ant (ari), trout (masu) and kite (tonbi) – and has been building the improvisational architecture, using solid concrete that supposedly lasts for 200 years.
For Noseden Art Line 2019, Oka visited Higashitokiwadai, fated by his old friend living there, and strongly sympathized with the feelings of the residents; how they admired the riches of the surrounding mountains and decided to live there. However, he also noticed that the road that should connect the residential area and the pathway to Mt. Nose Myoken is missing for some reason. Aiming to draw a line that would connect this interruption, he worked with the Higashitokiwadai residents, designing and mixing concrete, and they created a long column together. With the help of about 100 participants, gathered by an open-call, Oka will organize a “festival”, through which he will try to update the town planning by the residents’ own hands and reconnect the new town and satoyama (the surrounding domestic woodlands). 

http://arimasutonbi.blogspot.com