Encouraging citizens to come together & map the constellations above Oxford

An artist’s impression of Star Light Star Bright. Image: Hellion Trace.

The founder of Hellion Trace, a company specialising in augmented dance, on her latest project, Star Light, Star Bright – winner of the Smart Oxford Playable City Commission 2017, which launched across Oxford last Friday.

In 2016 I read a fascinating (though now disputed article) about a Canadian boy discovering the location of a potential ‘lost’ Mayan city. He’d correlated the known Mayan cities against their known star constellations and reached a potentially groundbreaking conclusion.

Despite being disputed, the publicity crystalised a thought that had been burgeoning across all our international collaborations: that despite our cities’ light pollution, the night sky constellations we see over head offer us a constant familiarity –until you are in a new city, in a new part of the world.

The call for the Smart Oxford Playable City Commission spoke about creating connectivity, and using the Internet of Things and smart infrastructure. A project for Oxford, a city that has huge flood-plains, and anticipates flooding each year. An outdoor, public installation in a UK winter city where it is dark from 4.30pm and sunrise isn’t until after 8am, at the time of year when our streets are at their most deserted.

I love a challenge like this: Hellion Trace have collaborated on projects in cities all over the world for years, each time looking for unique elements of the local, cultural identity and rhythm of a city.

For Oxford, responding to their theme of ‘Shared City’, I wanted to make a piece that was about the connections between us as individuals achieving something together, strangers meeting in the winter darkness to create light and connection. I wanted to celebrate the history of scientific and academic discovery, of the European Space Agency on the Harwell Campus, and yet reach beyond the quads and the city centre.

Today we can pre-map our journeys in great detail, walk around the city we are planning to visit in advance, plot travel times, find quiet routes, and cycle routes and even routes that smell nice. All of this digital (and paper!) infrastructure is almost omnipresent, but it still relies on us having access to a device. 

Often when we are abroad, we take the time to look up and are unsettled by a lack of familiarity overhead. The stars that we see in the night sky are so specific to each location. They are part of a city’s uniqueness that hides in plain sight, above our heads.

So just as looking up is an important act in helping citizens re-imagine their relationship with a city, we also know working with strangers creates a feeling of camaraderie and shared memory, and using light in a beautiful and engaging ways can help to reduce anti-social behaviour and change wayfinding in cities. Even whilst city lighting often masks the night sky, we all seek those moments when we suddenly see the starlight, shining bright.

Star Light, Star Bright spreads out across seven diverse sites in Oxford, both in and outside of the tourist and university areas.

Encouraging citizens to come together and map star constellations from the night sky above Oxford, this is a project designed to reach the edges of a city and all its’ demographics. With an intuitive and accessible entry point (stand on a light: it turns on) Star Light, Star Bright creates an immediate opportunity for serendipity, collaboration and spontaneity: each constellation needs more than one person to activate it to create the ultimate beam of light.

We have designed Star Light, Star Bright to be democratic and city-wide, demonstrating a shared city. It is a rapidly shareable activity that fits our visual world, easily captured for social media. Continued curiosity is encouraged; follow the map, hunt them all. Find all the constellations in Oxford. Look how the stars shine for you.

Laura Kriefman is founder of Hellion Trace.

Star Light Star Bright, winner of the Smart Oxford Playable City Commission, launched across Oxford on 19 January 2018 and will run for six weeks. You can find more information on the Playable City website here.


To beat rising temperatures, Vienna launches a network of 'Cool Streets'

A Vienna resident cools off at one of the city's new Cool Streets installations. (Courtesy Christian Fürthner/Mobilitätsagentur Wien)

Over the past several months, Austria has recorded its highest unemployment rate since World War II, thanks to the economic aftermath of the Covid-19 pandemic. With no job or a suddenly smaller income – not to mention the continued threat of the virus – many Viennese will opt for a staycation this summer.  

At the same time, last year, Austria’s capital experienced 39 days with temperatures of over 30°C (86°F), one of its hottest summers in history according to the Central Institute for Meteorology and Geodynamics.

Climate experts expect a similarly sizzling 2020 season, and city officials are now doubling down on efforts to combat the heat by launching a “Cool Streets” initiative as well as a new, state-of-the-art cooling park.

“As the city councilwoman in charge of climate, it is my job to ensure local cooling,” Vienna’s deputy mayor Birgit Hebein proclaimed at the opening of one of 22 new “Cool Streets” on 22 June.

“In Austria, there are already more heat deaths than traffic fatalities,” she added.

Hebein was referring to the 766 people the Austrian Agency for Health and Food Security included in its 2018 heat-associated mortality statistics. The number was up by 31% compared to 2017, and in contrast to the 409 people who died in traffic collisions the same year.

The project includes 18 temporary Cool Streets located across the city, plus four roads that will be redesigned permanently and designated as “Cool Streets Plus”.

“The Plus version includes the planting of trees. Brighter surfaces, which reflect less heat, replace asphalt in addition to the installation of shadow or water elements,” said Kathrin Ivancsits, spokeswoman for the city-owned bureau Mobilitätsagentur, which is coordinating the project.

Vienna's seasonal Cool Streets provide shady places to rest and are closed to cars. (Petra Loho for CityMetric)

In addition to mobile shade dispensers and seating possibilities amid more greenery provided by potted plants, each street features a steel column offering drinking water and spray cooling. The temporary Cool Streets will also remain car-free until 20 September.

A sensor in the granite base releases drinking water and pushes it through 34 nozzles whenever the outside temperature reaches 25°C (77°F) . As soon as the ambient temperature drops to 23°C (73°F), the sensor, which operates from 10 a.m. to 8 p.m., turns off the water supply.

The sensors were included in part to allay concerns about legionella, a pathogenic bacteria that can reproduce in water.  

“When the spray stops, the system drains, and therefore no microbial contamination can develop,” said Dr. Hans-Peter Hutter, deputy head of the Department of Environmental Health at the Center for Public Health at Medical University Vienna, in a televised interview.

Hutter also assured the public that there is no increased risk of a Covid-19 infection from the spray as long as people adhere to the one-meter social distance requirement.

But Samer Bagaeen of the University of Kent's School of Architecture and Planning notes that air cooling systems, like the ones used in Germany at abattoirs, have been found recently to be a risk factor for Covid-19 outbreaks.

“The same could be said for spay devices,” he warned.

Vienna’s district councils selected the 22 Cool Street locations with the help of the city’s Urban Heat Vulnerability Index. The map shows where most people suffer from heat by evaluating temperature data, green and water-related infrastructure, and demographic data.

“Urban heat islands can occur when cities replace the natural land cover with dense concentrations of pavement, buildings, and other surfaces that absorb and retain heat,” as the US Environmental Protection Agency states.

A rendering of Vienna's planned park featuring a Coolspot, which is scheduled to open in August. Click to expand.
(Courtesy Carla Lo Landscape Architecture)

Vienna’s sixth district, Mariahilf, is such an area. The construction of the capital’s first “Cooling Park”, a €1 million project covering the 10,600 square-metre Esterházypark, is designed to provide relief. 

Green4Cities, a centre of excellence for green infrastructure in urban areas, designed the park’s main attraction, the “Coolspot”. The nearly 3.40-metre high steel trellis holds three rings equipped with spray nozzles. Textile shading slats, tensioned with steel cables, cover them.

The effects of evaporation and evapotranspiration create a cooler microclimate around the 30 square-metre seating area, alongside other spray spots selectively scattered across the park.

The high-pressure spray also deposits tiny droplets on plant and tree leaves, which stimulates them to sweat even more. All together, these collective measures help to cool their surroundings by up to six degrees.

The landscape architect Carla Lo and her team planned what she calls the “low-tech” park components. “Plants are an essential design element of the Cooling Park,” Lo says. “By unsealing the [soil], we can add new grass, herbaceous beds, and more climate-resistant trees to the existing cultivation”.

Light-coloured, natural stone punctuated by grass seams replaces the old concrete surfaces, and wooden benches meander throughout the park.

Living near the park and yearning for an urban escape close by, Lo says she’s motivated to ensure the park is completed by mid-August.

“If we don't do anything, Vienna will be another eight degrees Celsius hotter in 2050 than it already is,” Hebein said.

Vienna recently came in first in the World's 10 Greenest Cities Index by the consulting agency Resonance.

“There is no one size fits all on how cities respond to urban heat,” says the University of Kent’s Bagaeen, who points out that Vienna was one of the first European cities to set up an Urban Heat Islands Strategic Plan in 2015.

In the short term, prognoses on the city’s future development may be more difficult: Vienna votes this autumn.

Petra Loho is a journalist and photographer based in Austria.