Bacground info about the contest on the organizer's website is very helpful to put the term into context:

Artists, architects and designers from all cultures are asked to make a sketch-design for an adventurous and expressive construction capable of achieving interaction within the context of the area and offering an environmental experience to the visitor.

Follies that will entice people to visit them, to study them, or else to drift off to another world. The folly will act as an intermediary between the genius loci and the public.

The history of the folly is equivalent to the history of the name folly, as regards the origin ascribed to the word as well as the meaning attached to it throughout the various ages. It essentially means: an architectonic object that is built to express a concept rather than for a functional purpose.

Since the fifteenth century, architecture has played a role in Italian and French garden as an element appealing to the imagination in a landscaped garden. The French word Folie has several meanings, such as: garden of delight, outdoor shelter as well as countryside landscaped garden. Constructing a garden was akin to achieving a heavenly dream. Architects were commissioned to come up with a building which primarily aimed at creating a mythical or mystical atmosphere.

Titel FOLLYDOCK IFCR international folly contest, Rotterdam (NL)
Land Niederlande
Einstelldatum 15.09.2005
Tender-ID 562
Kategorie Competition
Kurzbeschreibung Verfahrensart: Offener Wettbewerb Teilnahmeberechtigt: Architekten, Designer, Künstler Zulassungsbereich: International
Langbeschreibung Aufgabe: Follydock IFCR, the international Folly Contest Rotterdam, is a design competition for artists, designers and architects. The assignment is to design an original folly in the context of the Rotterdam harbour area. One condition is to overcome the restrictions of professional practice and to stretch the boundaries of fantasy and reality. The result will be an exposition of follies, built in and around Heijplaat, during the ArchitectureBiënnale Rotterdam in 2007
Kontaktdaten Weitere Informationen: www.follydock.com
Bietfrist 15.11.2005
kostenlos

明显这是一种艺术竞赛

搞笑

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Note added at 10 hrs 45 mins (2005-10-12 02:30:23 GMT)
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搞笑之作

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Note added at 10 hrs 53 mins (2005-10-12 02:38:38 GMT)
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怪异的装饰性建筑, LONGMAN CONTEMPORARY, Foreign Language teaching and research press, 2004 version

装饰性建筑, Oxford Advanced learner's, Commercial Press version.

It's possible to mean just a performance, act, etc, that make people laugh, then, 诙谐行为/谐趣演出, 搞笑行为, ETC, 甚至可用"喜剧"

鹿特丹国际建筑比赛/大赛
folly：造价高而无用的怪异建筑物，处理成“建筑”即可。

鹿特丹国际建筑造型竞赛