Calatrava ’ s contribution to Wohlen High School is a collection of four roofs : an outside entrance canopy , an inside entrance hall , the assembly hall and the library . While all four roofs are quite different , they are all signature Calatrava . This design is worthy of inclusion on my list , not only for its control of light , but also for its elegance in form and clever structure . The petal-like circular roof represents a very intelligent engineering form .

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