You’re hurrying along the sidewalk on the way to work, running late and not in the greatest mood, when you see a sign in the adjacent field that simply reads “PLEASE WAIT HERE, YOUR FUTURE SELF WILL MEET YOU SHORTLY.” How does that affect your day? Little moments like these can bring some much-needed levity to the world around us, especially in dark times.

Impeccably produced, often enticing you to push a button or take a card, these guerrilla installations look pretty legit until you stop to read what they say. They’re easy to miss, if you’re hustling too quickly and tuning out your surroundings – but if you take a moment to notice them, they might just make you smile.

Artist Michael Pederson (aka Miguel Marquez Outside) creates these little interventions and puts them up all over his home city. Sometimes they’re site-specific, referring to things that can be found in the local environment, like a hole in the curb or a sidewalk that ends abruptly.

The personal space cards would actually be pretty handy, and who wouldn’t be tempted by a time travel pay phone? Check out more of Pederson’s work at his tumblr and Instagram.

Over three hundred bus shelter ads across the UK have been replaced with thought-provoking works criticizing capitalist culture by 40 street artists. The ‘Brandalism‘ posters were installed in high-traffic areas, from the busiest shopping district of London to the Leeds  Half Marathon route and even outside Scotland Yard, right under the noses of the police officers lambasted by several of the designs.

“The large print giveth, the small print taketh away,” reads one, while another parodies Harrod’s department store with “Horrids – trite gewgaws, trinkets & trash, the cluster bombs of consumerism.” “The market is dead, long live the market,” a third repeats.

The campaign is a response to the fact that the UK’s advertising industry pays just under 250 per person each year to reach the ears and eyeballs of the citizens i the hopes of selling things like “adjustable mops and leather sofas.” Plus, the industry relies on manipulation ranging from the subtle to the overt, convincing us that we won’t be happy until we make more money in order to purchase all of this stuff. It’s not about catering to our needs, it’s about creating new desires.

The campaign explains, “The fight against advertising is not a fight against desiring. We should want more from life not less, and we should demand it. The question is more of what? This exhibition is about trying to open up questions about the ills created by advertising, the false needs and destructive desires it attempts to distill in us, and it is about trying to reclaim some of the spaces taken from us.”

Brandalism even has a suggestion for anyone who isn’t a big fan of the work their artists produced: “Swapping them is easier than you’d imagine. All you need are some o the magic cabinet keys and a trusty hi-viz vest to remain hidden in plain sight. So if you don’t like what we’ve put up, check out our guide to opening the cabinets, and replace it with something you prefer. Because after all, they’re your streets.”

If city officials won’t do their part to make public spaces more fun, efficient, useful, comfortable and creative, citizens will take matters into their own hands. DIY urbanism, or ‘hacktivism,’ is the practice of altering urban environments in ways that aren’t officially sanctioned, whether by turning vacant lots into temporary playgrounds, adding swings to bridges, seed-bombing neglected city spaces or knitting giant hats for bus stop shelters.

City Swings

The spaces under piers, beside bridges and beneath industrial remains are transformed into instant playgrounds with surreptitiously installed swings funded by The Awesome Foundation for the Arts and Sciences. The Los Angeles chapter of the group awarded its $1,000 2011 grant to artist Jeff Waldman, who chose underutilized spots around the city to install temporary swings. A similar project hung spill swings from the handrails on San Francisco’s BART public transit system, while the more complex 21 Swings project in Montreal coordinated the urban swings with music for an interactive experiment.

DIY Urban Furniture

If there aren’t comfortable places to sit and hang out in urban locales, perhaps the people should just create them, whether they turn scaffolding into instant hangouts with bracket-equipped furniture or bring specially made tables that fit perfectly onto public steps. Some temporary installations have gone so far as to create entire urban living rooms complete with couches, bookshelves and coffee tables that invite passersby to take a seat, relax, get to know each other better and enjoy impromptu musical performances. One particularly creative guerrilla seat design is simply a piece of plywood printed with an icon of a chair that attaches quickly and easily to street signs and can be folded up when not in use.

Vacant Lot Playgrounds & Hangouts

It’s incredibly frustrating when your neighborhood lacks a decent playground or public recreation space, yet multiple vacant lots surrounded by razor wire-topped fences waste away for years on end. Why should such spaces be closed off to the public when they’re not in use? Many DIY urbanism projects focus on reclaiming these spaces with non-permanent setups for community gardens, swing sets and even mini golf. Repurposing vacant lots maintains a sense of vitality and egalitarianism in the community, especially during times of economic sluggishness when planned construction projects are indefinitely delayed.

Yarn Bombing

Who wouldn’t smile at custom-crocheted sweaters for trees, phone booths and bicycles? Yarn bombing is the practice of adding knitted and crocheted additions to all sorts of public objects, just for the fun of it. Bus stops are given giant winter hats, bus seats get a lot cozier and stop signs suddenly become red flowers with the addition of green leaves and a ‘stem.’

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City Hacktivism 12 Fun Diy Urbanism Interventions

Far removed from the small-time taggers that can’t resist any unmarked urban surface, muralists and street artists bring gallery-worthy art to the streets where they can be enjoyed by all. Sometimes the murals are commissioned and sometimes they’re done guerrilla-style under cloak of night, but splashed across the surface of a bare concrete wall or the unadorned face of an abandoned building, they’re a welcome touch of color and character.

Incredible Giant Treehouse Mural by Swiatecki, Poland

(images via: my modern met)

A mural of any size is quite an undertaking even for experienced artists, but imagine painting the entire facade of a 12-story building. Swiatecki, a Polish painter, graphic designer and urban activist, says that this impressive stylized treehouse – which even incorporates some of the windows on the building into the design – took 9 people, 350 80-liter cans of acrylic paint, 3 months and 7 days to complete.

Trompe L’Oeil Murals of John Pugh

(images via: illusion-art.com)

Celebrated 3D mural artist John Pugh has created stunningly deceptive works of art all over the world. In Santa Cruz’s ‘Bay in a Bottle’, Pugh trucks us into seeing the so-real-you-could-touch-it figure of a man standing in front of a landscape scene inside a transparent tube. Another mural, Siete Punto Uno in Los Gatos, California, reveals  a temple to the Mayan jaguar god – considered “the propitiator of earthquakes”. Amazingly, even the woman peering inside is painted.

“I have found that the “language” of life-size illusions allow me to communicate with a very large audience,” says Pugh on his website. “It seems almost universal that people take delight in being visually tricked. Once captivated by the illusion, the viewer is lured to cross an artistic threshold and thus seduced into exploring the concept of the piece. I have also found that by creating architectural illusion that integrates with the existing environment both optically and aesthetically, the art transcends the “separateness” that public art sometimes produces. “

Abstracted Figures by Damon Ginandes, Brooklyn, NY

(images via: wooster collective)

In the boarded-up windows of an abandoned building that would otherwise be an eyesore are dreamy abstracted figures rendered in spray paint and latex acrylic – matching those on a nearby wall. These paintings by Damon Ginandes are in his home neighborhood of Red Hook in Brooklyn, New York. Ginandes, who has worked in film post-production, is now pursuing art full-time and also shows in galleries.

Ninia Kukul by Stinkfish, Colombia

(images via: graffart.eu)

The streets of Colombia get exciting blasts of color in the most unexpected forms thanks to street artist Stinkfish, who uses photographs of his friends and family to create the realistic yet stylized portraits seen all over the country.

Vortex of Faces by Liqen, Spain

(images via: my modern met)

You could stare at this massive mural by street artist Liqen for hours, continually noticing new details like dog faces, hands, tentacles, stitches and other odd inclusions. But take care not to get sucked in – it looks kind of scary in there.

Art Doesn’t Help People by Herakut, Germany

(images via: my modern met)

Hera plus Akut equals Herakut, a male and female duo of graffiti artists that combines their contrasting styles to create vivid, unusual murals and street art like this piece on a wall in Germany. Akut puts down a base layer of spray paint and then Hera comes in and adds painterly details that are more often seen on canvas than on brick and concrete, making their collaborative efforts some of the most distinctive in the world of street art.

Curving Skeleton by ROA, Santander, Spain

(images via: my modern met)

When a gigantic black and white animal appears on a wall in an urban area, one graffiti artist is more than likely responsible: Ghent, Belgium-based ROA, whose street work has been seen in metropolises around the world from New York to Warsaw. ROA has also begun exhibiting in galleries in 2010, including a show at London’s Pure Evil Gallery in April.

Scott Radke’s Ohio Public Art

(images via: scottradke.com)

Known internationally for his dark yet charming marionettes and sculptures, Ohio artist Scott Radke has also graced his home town of Tremont as well as Ohio City with several public and privately commissioned murals in his signature style. Beloved by locals, some of the works were threatened by the sale of the land they stood on, but the painted cement shapes that were once part of a playground were moved and auctioned off to collectors.

Dalata’s Sea Life Mashup, Rotterdam

(image via: wooster collective)

Brazilian artist Andre Dalata made this whale of a mural in Rotterdam, mixing sea creatures like stingrays, porpoises and fish of various species into a surreal many-eyeballed conglomeration. Dalata, who started his street art career in 1997 in his hometown of Belo Horizonte, often incorporates nature into his designs.

Marguiles Mural by The Mac & Retna, Miami

(images via: mash kulture)

Every year at Miami’s famed Art Basel modern art exhibition, street artists The Mac and Retna team up to create a new mural. This one, from 2009, was painted for the Marguiles collection as part of Primary Flight, an annual street art installation throughout the Wynwood Arts District in Miami. Retna’s responsible for the background while The Mac paints the figures in his signature engraving-like style.

Photo-Graffiti by JR, Brazil

(images via: jpgmag)

The hills have eyes, literally, thanks to “photograffeur” – that’s photographer and ‘graffeur’, French for graffiti artist – JR, who gave a downtrodden Brazilian favela a curious makeover. The artist, known only by those initials and nearly as mysterious as Banksy, travels to downtrodden neighborhoods to carry out his largely unauthorized photo-pasting projects. But far from being angry about the work, locals – who are themselves typically the subjects of the photos – see him as a hero. Some of the photos, printed on waterproof vinyl, double as new roofs.

JR was awarded the 2011 $100,000 annual prize from the TED conference (technology, entertainment and design) and says he will reinvest the prize money into his ever more ambitious projects, just as he did with the $35,000 he made from selling one piece at auction in 2009.

“If there’s one thing I’ve always taken care of with my work, it’s that it’s never an advertisement for anything other than the work itself and for the people it’s about ? no ‘Coca-Cola presents,’ ” he told The New York Times. “I think the TED people knew that that was one of my main concerns, and I feel pretty sure that we can come up with a project that works that way.”

Fish on a Hillside by Haas&Hahn, Brazil

(images via: favelapainting)

Before they turned the Santa Marta slum in Brazil into a cheerful candy-colored canvas, street artist duo Has & Hahn worked on a project that is perhaps even more impressive. An ugly concrete hillside in another Brazilian favela was transformed into an ocean full of fish in a Japanese-inspired, tattoo-like style.

Philadelphia Muses by Meg Saligman

(images via: sashafatcat)

The city of Philadelphia is resplendent with incredible works of public art, and many of them originated in the mind – and on the computer – of artist Meg Saligman. Saligman, known for works like “Philadelphia Muses” (above), “Theater of Life” and “Passing Through”, creates the designs and then works with the community so they can paint the murals themselves. Her designs have been brought into reality with the paintbrushes of city residents and even prison communities. Saligman’s work isn’t limited to Philly – it can be seen around the world. Among her works is the largest publicly funded project in the U.S., located in Shreveport, Louisiana.