This was the first spiral tiling discovered, by Hans Voderberg in 1936. The unit tile is a bent enneagon.
All lettered edges are equal in length.
Like most radial tiles, this one can also be derived by deforming a triangle, in this case an isoceles 12-degree triangle. Thus Voderberg tilings are not normal because contacts between two adjoining tiles are not connected. Two Voderberg tiles can even enclose a pair of tiles. . The Voderberg tile, of course, can be used to construct a simple radial tiling. The spiral Voderberg tilings are spectacular since the hooks in the tiles enhance the spiral appearance and the small apical angle of the tiles makes for very smooth curves.