Abstract: In order to provide a wall segment for a wall of a cabin, especially a cabin for a paint spraying plant, comprising a supporting construction which, for its part, comprises substantially vertically aligned posts and substantially horizontally aligned crossbeams, and planking which is held on the supporting construction and comprises a front face that faces the interior of the cabin when in its mounted state and extends over substantially the full height of the wall segment, and a window section arranged in the front face, which is easy to clean and is extremely reliable in operation, it is suggested that the front face of the planking is in the form of a plane surface free of horizontally extending bend- or fold-lines.