Are We In a Period of Irrational Exuberance or Unusual Creativity in Architecture?

Will the starchitect era that produced insanely tall buildings like the 2,717-foot Burj Khalifa and a surfeit of "green luxury" highrises be remembered as one of irrational exuberance or of unusual architectural creativity? Architectural historian Jayne Merkel opts for the latter.

Photo (CC) by Flickr user Joi.