When viewed in cross section, the river produces a three-dimensional flow vertically and horizontally. This stool is a solid wood stool made with the three-dimensional natural flow in mind. The seat and side plates are not made of one plate, but by dividing the plate material, it can be made using materials with good yield. It does not look like a Japanese bath chair, and the top plate extends slightly to the left and right, providing clues when carrying it.