The National Gallery of Denmark has teamed up with Roskilde Festival to facilitate a series of collaborative art events at the upcoming festival in June.

The biggest event, quite literally, is Museo Aero Solar - a huge solar-powered air balloon made of reused plastic bags.

The artwork is conceived by the artist Tomas Saraceno and festival goers can participate by collecting plastic bags and taping them together in small sections. The sections of various bags are eventually connected and formed into a big balloon that will float above the ground.

You can participate + win tickets to the festival by donating at least two (clean) plastic bags. Send your bags by post to the National Gallery of Denmark (or stop by in person if you are in Copenhagen) before june 13th.

The photos are from a previous event.

To win festival tickets (or simply participate for fun) send your plastic bags to:

Statens Museum for Kunst
Att: Morten Sørensen
Sølvgade 48-50
1307 København K
Denmark

• www.smk.dk/roskildefestival2011