Born in 1940 in Yamanashi Prefecture, Japan, he graduated at the Craft Course in the Faculty of Fine Arts at the Tokyo National University of Fine Arts & Music. he is know for making the Yoshimoto Cube in 1971. He discovered this cube when he was searching for a way to divide a cube equally in three-dimensional space. He first introduced his cube in 1972 at a solo exhibition entitled "From Cube to Space," and later Yoshimoto came out with three commercial versions: YOSHIMOTO CUBE No. 1, No.2 and No.3. In 1982, Yoshimoto's cube was included in the MoMA's permanent collection. This was followed with other products based on the theme of the polyhedron, some of which he marketed, such as YOSHIMOTO PARALLELOGRAM and YOSHIMOTO SCOPE. He also published books based on his research into polyhedral forms. His work has appeared in Hyper Space, the journal of the Japan Society for Hyper Space Science. From 1999 to 2001, he has held three solo exhibitions of his work.