Bird Hangar is an architectural installation for the Yokohama Triennial 2001 by Finnish architects and artists Casagrande & Rintala. [1] A cone shaped steel frame building covered with hemp rope sending up balsa -made birds attached to meteorological balloons up to 10 km where the balloon would explode and the bird start gliding landing either in the Japanese islands or to Pacific Ocean. The bird carries 5 seed of basic Japanese vegetables and a note asking who ever finds the bird to contact Casagrande & Rintala and plant the seeds. [2]
Bird Hangar, along with Yoko Ono’s Freight Train, was widely regarded as a highlight of the Yokohama Triennale. [3]


References
^ [1] - International Triennale of Contemporary Art Yokohama 2001: Artist Data Sheet
^ [2] - ARCH'IT: Casagrande & Rintala 1.11.2001
^ [3] - Adam Mornament: When Attitude Becomes Form Contemporary Magazine 2003