Premise: The north tower, the Tour Saint-Romain, has the sober simplicity of the cathedral's early Gothic beginnings in the 12th century, while the taller, more elaborate south tower, the Tour de Beurre, is Flamboyant Gothic of the 15th century.

Hypothesis: Both the Tour de Beurre and Tour Saint-Romain are modern churches in the brutalist architectural style.
Relation: contradiction