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Shadow watching from an inflatable sculpture in Lisbon

Rafael Marchante / Reuters

A visitor plays with her silhouette inside the "Luminarium" inflatable structure by British designer Alan Parkinson in Lisbon on Friday, August 1. The Luminarium is a sculpture where people enter to experience "a sense of wonder and the beauty of light and color", according to the organizers.

Rafael Marchante / Reuters

A visitor plays with her shadow inside the "Luminarium" inflatable structure by British designer Alan Parkinson in Lisbon August 1, 2011. The Luminarium is a sculpture where people enter to experience "a sense of wonder and the beauty of light and color", according to the organizers.

Rafael Marchante / Reuters

A child jumps inside the "Luminarium" inflatable structure by British designer Alan Parkinson in Lisbon on Friday.