saw this one today... the exhibition is small but is quite good as it shows the construction of high rise earth buildings... its on till february so if you are near check it out...
An artist published a pattern for knitting leaves, then asked their local community to send in the results. In the end this crochet tree was grown. Each leaf was not tied off so when it was installed in the desert for he Burning Man festival the entire structure would unravel in the wind. Nice....