An in-ground, pneumatically-operated, extensible-and-retractable landscape light comprised of an elongated outer housing having an air inlet in its body and an opening in its upper end into which is received in a telescoping, mating relationship an elongated inner housing which has a light source operably...http://www.google.fr/patents/US5628558?utm_source=gb-gplus-shareBrevet US5628558 - Pneumatic landscape light
