The Pop-up City: A Proposal For Augmented Reality As a New Urban Layer

"I think the massive doses of Videodrome signal will ultimately create a new outgrowth which will produce and control hallucination to the point that it will change human reality. Television is reality, and reality is less than television." — Dr. Brian Oblivion, Videodrome

In 1901, L. Frank Baum imagined a pair of electric spectacles that could overlay text onto the wearer's field of vision — a throwaway invention in a children's novel. Forty years later, a Boeing engineer named Tom Caudell needed a word for the headset he was building to guide assembly-line workers, and borrowed a term from science fiction: augmented reality. The line from Baum's gadget to Caudell's headset to the device in your pocket is not technological progress so much as the slow collapse of a distance we always knew was closing.

What is a city, if not a layered system of information projected onto physical space? Every street sign, every storefront window, every piece of graffiti is a claim on a surface — someone's bid to make a place mean something. Augmented reality doesn't invent this. It accelerates it, democratizes it, and makes the layers switchable.

Five layers, not four

Spatial sociologist Dieter Lapple spent decades arguing that urban space has four dimensions: the physical substrate, the social use patterns, the regulatory framework, the symbolic meaning. AR adds a fifth — one that sits on top of all the others and is controlled by none of them.

That fifth layer is already fragmenting into sublayers, each with its own logic and its own politics.

Navigation was the first to arrive at scale. Google Maps' Live View, Yelp's Monocle, the heads-up display in a Cadillac Lyriq — these are wayfinding tools, prosthetics for orientation. Useful, uncontroversial, quietly reshaping how we read a street.

Art arrived next, and immediately became a battleground. In 2017, Snapchat and Jeff Koons placed a virtual Balloon Dog in Central Park — a $58 million sculpture, dropped into public space without permission, accessible only through a corporate app. Sebastian Errazuriz responded by digitally "vandalizing" it, placing his own AR graffiti over Koons' graffiti over the park. Who owns the air above a public square? The question had never needed asking before. In 2011, Mark Skwarek had already pushed this further: #arOCCUPYWALLSTREET overlaid protest messages directly onto the facades of banks in New York's financial district. The buildings remained unchanged. The meaning did not.

Games turned the city itself into a board. Pokémon Go sent millions into parks and alleyways they had never visited. Ingress turned urban infrastructure into contested territory between factions. The city as playground is not new — children have always known this — but AR makes the playground programmable, persistent, and shared.

Memory may be the most quietly radical sublayer. Alexandre Devaux built a HoloLens experience that lets you walk through Paris as it looked a century ago, the demolished and the rebuilt coexisting in the same space. John Craig Freeman projected Neda Agha-Soltan's face onto the Azadi Tower in Tehran — a memorial in a place where physical memorials are forbidden. AR as a technology for holding what a city officially refuses to hold.

The city that pops up

Here is the question that matters: who builds the fifth layer?

If the answer is corporations and municipalities alone, AR becomes the most efficient advertising surface ever constructed, wrapped around every surface you encounter. Surveillance becomes ambient. The public square becomes paywalled — visible only through the right app, the right device, the right subscription.

If the answer includes everyone, the fifth layer becomes something stranger and more interesting: a space where the immigrant overlays their home country onto the street they walk every day, where the historian annotates the building that used to stand here, where the protester marks the wall that cannot be touched. A city that pops up differently for each person moving through it — not because reality has fractured, but because reality was never singular to begin with.

The Pop-Up City is not a utopia. The risks — intrusive advertising, algorithmic redlining, the replacement of shared civic space with personalized bubbles — are real and require real governance. But the premise is worth defending: that the digital layer above our cities is public infrastructure, not private real estate. That the fifth dimension of urban space belongs to the people who live in it.

Lev Manovich defined augmented space as "physical space overlaid with dynamically changing information, multimedia in form, localized for each user." What he described as a technical condition is also a political one. The question of who controls the overlay is the question of who controls the city — and that question is older than AR, older than cities, older than Baum's electric spectacles dreamed up in 1901.

We are just now getting the tools to answer it badly, or well.