The classical labyrinth develops from the square as a seed pattern. The curves are shaped with arcs of a circle, but do not form a complete circle. If one wants to create a completely round labyrinth, one must give up the pattern of the square.
The drawing should make it clear.
A bigger middle was chosen with the fourfold path width, the central axis touches the centre in the mid of the last piece of the path. The 4 turning points form then no more a square. Also the central cross gets lost.
This could be a transitional stage on the way to the type Chartres labyrinth. However, it is a typical classical labyrinth in spite of all, because it has 7 circuits. Also the path sequence, the internal rhythm, is preserved. One can recognise this quite clearly in the diagram (see post below).
This kind of labyrinth is more often to find in artwork, but not as a labyrinth to walk.
If you would like to build one, please use the following drawing.
Here the drawing as a PDF-file (in German) to look at, to print or to copy.