A lot of people were not very fond of Eliasson's Waterfalls. They were slightly underwhelming, but after his incredible exhibit, Take Your Time, at MoMA last year, a bloodclot I gave NOT.
Olafur Eliasson has created this incredible book called Your House, commissioned by MoMA. I need to find out more on this, and see if/when the museum plans on showing it.
Via Kremo (in German). The English translation is here.