Since the 1990s Koo has been working on the reinvention of spaces with site specifc works. Her works frequently include architectural elements, drawings, fictions, poetries, publications, installations, sculptures, films, audio works and architecture projects.
Koo's most recent project is a glow-in-the-dark skatepark series. The first skatepark named OTRO was built in 2012 in collaboration with L'Escault Architectures, and was erected on Vassivière Island, France. The second, EVERTO, was built in 2015 in Liverpool, UK for the 2015 Liverpool Biennale; and most recently ARROGATION was built in 2016 in Sao Paulo for the 32nd Bienal de Sao Paulo.