This square has an irregular shape that is roughly triangular. However, the side that appears in the center of the photograph is not straight - it is convex, which usually tends to diminish the sense of enclosure. In this case, however, the degree of curvature is so slight that I don't think it harms the square.
In a similar vein, the surface of the square appears to be irregular - there seems to be a concavity in the middle distance and a convex surface near the extravagant fountain.
This was probably a difficult site for a square, and a good job has been done under the circumstances.
The formal Greek building is not in keeping with the other buildings, but I do not believe that this does any harm.
It's instructive to observe which "mistakes" are acceptable, and which ones are not.
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