In a futuristic European port city that's already unleashed trash-eating aquatic drones to clean up its harbor, you might wonder what could possibly come next in terms of innovative methods of clearing plastic waste from polluted waterways.

Rotterdam-based environmental organization the Recycled Island Foundation is on it.

While impressive-looking floating "litter traps" devised by this fledgling foundation are certainly worthy of recognition, it's what the group has done with the captured plastic waste post-recovery that's more notable: they've introduced the plastic back into Rotterdam's bustling harbor as a snazzy floating green space dubbed Recycled Park.

Functioning mostly as a lushly planted offshore refuge for urban wildlife that's only partially accessible to people, Recycled Park stretches 1,500 square feet across a chain of interlinking hexagonal platforms constructed from recycled plastic and anchored to the harbor floor. Staggered at different heights, the platforms — buoyant garden beds, really — are planted with different types of vegetation geared to attract a range of critters including nesting aquatic birds. The whole beautiful spread is captured in the video below.

What's more, the undersides of the green "building blocks" that bob just below the surface are specifically designed to nourish aquatic life. As the foundation explains, the bottoms of the platforms have "a rough finishing where plants can have enough surface to grow and fish a place to leave their eggs." This, in turn, can help "upgrade the ecosystem of the harbor."

(The recycled plastic blocks, by the way, were developed by the foundation with input from students from several Dutch universities including TU Delft, Rotterdam University and Wageningen University.)

Also running through the quaint harborside park is a canal where, as the foundation explains, "birds and small fish can find shelter here and the space to grow before entering the deep waters."

Nothing goes to waste in the Recycled Park concept just unveiled in Rotterdam. (Photo: The Recycled Island Foundation)

Nothing goes to waste in the Recycled Park concept just unveiled in Rotterdam. (Illustration: The Recycled Island Foundation)

A floating refuge for birds, bees and people

With floating greenery firmly covered, what about the park-y part of Recycled Park — the public space?

As mentioned, the project — a prototype at this point that could ultimately be improved and expanded — is mostly for the birds (and fish and insects and so on) as it predominately aims to "stimulate ecology in Rotterdam Harbor."

There are, however, two platforms that function exclusively as seating elements. Connected to the shoreline by gangplanks, these floating conversation pits, one on each end of the park, resemble oversized hexagonal hot tubs that have been drained of water. They look like pleasant places to sit back and relax out on the water, watching massive boats pass by amidst greenery that gently undulates with the waves of the harbor.

Recycled Park has two hexagonal seating areas with sweeping views of a historic harbor basin in the heart of Rotterdam. (Photo: The Recycled Island Foundation)

Unveiled on July 4, Recycled Park is currently floating in Rijnhaven, a quiet harbor basin on the south bank of the Nieuwe Maas, a distributary of the Rhine that flows through the heart of Rotterdam and into North Sea. Not too far from Recycled Park — also home to a striking tri-domed floating event pavilion and and a floating forest — is Rotterdam's iconic Erasmus Bridge.

This all being said, Recycled Park, flanked by glistening residential high-rises and amenities galore in a revitalized industrial area located smack dab in the middle of Europe's busiest port, is in the primo spot as far as waterfront Rotterdam real estate goes. (Easy access to public transit and water taxi doesn't hurt.)

In its current location, this singular park prototype will be seen — and get used.

Recycled Park features a small canal meant to shelter young and resting wildlife from the rest of Rotterdam's expansive harbor. (Photo: The Recycled Island Foundation)

Making good use of 'plastic soup'

One might wonder exactly how much marine waste the Recycled Island Foundation retrieved from the Nieuwe Maas in order to fabricate the park's recycled plastic platforms all the while demonstrating that "recycled plastic from open waters is a valuable material and suitable for recycling?"

While the foundation doesn't give any exact number in terms of quantity, is does note that the "trapping process" in the harbor and river took roughly a year-and-a-half.

A press release (perhaps with a bit lost in translation) explains:

"This resulted in a good working system, that works efficiently even with heavy ship traffic, tidal changes and different wind directions. The Litter Traps catch the plastics by using the existing stream of the river and keep the plastics inside even when the direction of the stream turns."

The Recycled Island Foundation has devised an innovative litter trap meant to be installed in waterways plagued by 'plastic soup.'. (Photo: Recycled Island Foundation)

Architect Ramon Knoester, who founded the Recycled Island Foundation as a way to "find an active approach to worldwide plastic pollution in open waters," explains why drawing attention to the scourge of plastic polluting the world's oceans and waterways — aka "plastic soup" — is even more important that injecting a dash of greenery-studded oomph to the industrial Rotterdam waterfront:

The water is in many cities the lowest point, resulting in the unfortunate accumulation of litter in our rivers. When we retrieve the plastics directly in our cities and ports we actively prevent the further growth of the plastic soup in our seas and oceans. Rotterdam can set an example for port cities everywhere in the world. The realization of the building blocks in recycled plastics is an important step towards a litter free river.

In April, months before Knoester's recycled plastic floating garden debuted at Rijnhaven, he gave an interview to U.K.-based outdoor adventure news site Mpora while attending the Edinburgh International Science Festival.

He elaborates more on the ultimate aim of Recycled Park: "Hopefully people become aware that if you collect your plastics and hand them in, you can still make nice, new products with it," he says. "So hopefully one day we'll reach the point where people will say 'okay we'd like to have more floating parks and more floating structures, so we should be more careful with our plastic waste.'"

Recycled Park is located near the landmark Erasmus Bridge in an old industrial area that's attracting visionaries of all stripes. (Photo: The Recycled Island Foundation)

Rotterdam: The port city obsessed with a greener, cleaner future

Knoester hints to Mpora that he'd like to eventually trial the Recycled Park concept in other port cities like London and Antwerp, both cities that, similar to Rotterdam, straddle heavily trafficked tidal rivers that flow into the North Sea. And even if the work of the Recycled Island Foundation remains limited to Rotterdam for the near future, you really couldn't ask for a better place to launch a biodiversity-bolstering floating park-garden made from recycled plastic.

After all, Rotterdam already has funky pedestrian crosswalks and flamboyant market halls down pat.

While quintessentially Dutch in disposition, the Netherlands' second-largest city is very un-Dutch when considering its vaguely Los Angeles-like urban landscape. Nearly leveled completely by bombing during World War II, Rotterdam was rebuilt in a wildly different manner than the city that came before it. The result is jarring, exciting and a bit schizophrenic. This is a city that has been glancing into — and embracing — the unconventional and the innovative ever since it was reborn in the 1950s.

An epicenter of envelope-pushing architecture and urban design, Rotterdam has emerged from the shadows and is no longer just Amsterdam's gritty (and weirdly American-looking) little sister. (Photo: Jerry Lampen/AFP/Getty Images)

Because of its gritty industrial history and its relentless drive to innovate, Rotterdam tends to attract fearless visionaries — entrepreneurs, engineers, urban planners, scientists, architects and on. As Fast Company detailed in a 2016 feature on the city's emergence as a global hotbed of sustainable urban design, Rotterdam is a city that "loves to play with new ideas."

In addition to mentioning a slew of more radical in-the-works projects like a floating dairy farm and a massive housing development that also doubles both as a wind turbine and an observation wheel, Fast Company chats with Daan Roosegaarde. Perhaps Rotterdam's most well-known sustainable designer, Roosegaarde has received significant international attention for his socially aware and sensorially dazzling creations, which include glow-in-the-dark bike paths and a sculptural 'smog vacuum cleaner.'

"Why not be in a city where you can test it, make a mistake, learn something?" he tells Fast Company of his adopted city. "It's a playground where you experiment, you show what works. Then you scale and go onwards."

So keep an eye out ... you might just see a recycled plastic micro-park float into a port city near you.