Urban Playground
 
 Mobilenin (media artist Jürgen Scheible) reimagines spaces by transforming buildings and objects into ephemeral works of digital art, using a light based spray-painting tool controlled by his mobile phone.
 
 
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Playing with your food rarely yields such epic results as Liz Hickok's dramatic renderings of San Francisco, constructed entirely out of colourful blobs of Jell-O that glow in a stunning, dreamlike way when lit from beneath.

Behold the wobbly wonder:
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Many of the world's great cities have been built and organized around rivers. Once the lifeblood and centre of a city, a vital transport and commercial/trading artery, rivers have in the last century or so become increasingly spatially and culturally disconnected from the cities that they flow through. Henk Hofstra's really cool 2007 public art project 'Blue Road', creates a make-believe river running through the Dutch town of Drachten by painting a 1000 metre stretch of road electric blue. It's a simple but visually stunning concept that serves as a vibrant and whimsical memorial to the waterway that once existed where the road now lies, and dramatically re-orients how we look at and make sense of an urban space (and perhaps its relationship to nature). Instead of seeing a meaningless tangle of faceless roads, the former waterway is repositioned and reclaimed as a central connecting thread and point of reference that links a town and community together. 
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A quick poke around Drachten on Google Maps in 2010 (see below) shows what's left of the Blue Road.
 
 
Papergirl Berlin: www.papergirl-berlin.de
Papergirl San Francisco: http://papergirlsf.wordpress.com
Papergirl World: http://papergirl-world.blogspot.com
In 2005, Berlin artist Aisha Ronniger was looking for imaginative ways to get around local anti-graffiti laws that were increasingly clamping down on wheatpasting. The result was Papergirl, an annual art project that literally delivers art to the proverbial man/woman in the street- in the new and novel form of the old-school American paperboy. Every year, artwork contributions to the project (there are no guidelines or restrictions to contributions- as long as they're flexible enough to be rolled up) are first displayed in a gallery setting, then bundled up into rolls of 10-15 items, to be tossed into the hands of an unsuspecting passerby in a serendipitous, fun and completely free encounter with art in the middle of everyday urban life.
 
 
                                                        http://thingsweforget.blogspot.com

           Random words of wisdom in public spaces-- because we all need gentle reminders sometimes!
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                                                       www.whatdoyouwanttobestranger.com

The interactive installation starts with participants mapping their own journeys through the city in a Passport.
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Check out more Travellers' Passports and the rest of the project here.
 
 
                                                http://www.blasttheory.co.uk/bt/work_cysmn.html

Can You See Me Now? is a game that happens simultaneously online and on the streets. Players from anywhere in the world can play online in a virtual city against members of Blast Theory. Tracked by satellites, Blast Theory's runners appear online next to your player on a map of the city. On the streets, handheld computers showing the positions of online players guide the runners in tracking you down.