Who wouldn’t like to occasionally swing suspended above the streets of the CBD, gently swaying in the wind while you watch the passersby below? An installation piece called 'Double Happiness', produced for the 2009/2010 Shenzhen and Hong Kong Bi-City Biennale allows you to do just that. They’ve cunningly transformed the everyday structure of a billboard into a playground in the sky, which they refer to as a piece of 'urban furniture', and what we refer to as possibly the best swing-set ever. The work 'responds to the society of materialism where individual desires seem to be prevailing over all', explains the Bureau de Mesarchitecture. The playground allows you to reclaim public spaces and the fragments of the city usually forbidden and hidden. This is a game for two, allowing you and a friend to experience a different perception of space and weight, and uncover a different experience of the social and physical world. Just like grabbing the swing set with your best friend as a kid, you can now ascend a staircase together and stake out the billboard playground, competing over who can swing the highest as you float over the city.