When Four Nights of Light Turn Permanent: Signal Festival and Prague Goes Year-Round

In October, the days in Prague grow short and the air begins to cool. In this season, at the threshold of the Central European autumn, streams of people form night after night along the cobbled lanes of the Old Town, at the foot of the bridges across the Vltava, and in the squares ringed by Gothic spires. What they have come for is the moving image projected onto the walls of buildings, and the installations of light set out along the streets. After sunset, the outline of a familiar historic city turns into a succession of enormous screens and objects. Signal Festival is one of Central Europe's largest festivals of light and digital art, held over a few nights of October every year since 2013.

What this essay sets out to read is the fact that in 2025 the festival arrived at a fork in its road. A seasonal event that occupies the city for four nights only produced, out of its own interior, a permanent gallery open the year round. Within the category this journal calls KŌ (候) — the lineage that makes climate, season and time-limitedness the condition of a work's coming into being — Signal Festival stands in a position from which it questions that condition itself.

From an Astronomical Clock, 2010

The point of origin of Signal Festival lies earlier than the festival itself. In 2010, when Prague's astronomical clock marked six hundred years since its installation, the art group The Macula projected a large-scale video mapping onto the wall of the clock tower. Covering the surface of a historic building with imagery about time and memory drew a considerable response, and gave the method of treating the city itself as a screen a sense of traction.

On the strength of that success, the producer Martin Pošta, the curator Jan Rolník, and Amar Mulabegovič, an artist from The Macula, launched Signal Festival in 2013. The first edition ran from 17 to 20 October and drew roughly 250,000 people. The architecture of a historic city covered by imagery that lasts a single night — the method confirmed at the clock's six-hundredth anniversary was here extended into the framework of an annual event with the whole city as its venue.

Four Nights as a Condition

What characterises Signal Festival is its brevity. The run amounts to no more than four nights each October. In 2026 it is set for 15 to 18 October. Within this narrow window, visitors walk the streets and meet works of light that rise point by point out of the dark.

The scale of attendance was enormous from early on. The second edition, in 2014, nearly doubled it, to roughly 460,000; by the fourth, in 2016, a count by the sponsor company Cisco put it at roughly 580,000. In 2025 attendance again exceeded 500,000, and across thirteen editions since the founding the cumulative figure passes five million. A few autumn nights in a single Central European city have become the cultural event that draws the largest audience in the Czech Republic. There has been one interruption only: in 2020, under COVID-19 restrictions, the festival went unheld for the first time since its founding.

The constraint of four nights is not merely a matter of operational convenience. Only because the long nights of autumn are there as a temporal ground do the lights of the street emerge as figure. During the day the projection surfaces return to being familiar walls, and the squares return to being practical thoroughfares. Once the sun goes down, the same places invert into objects of contemplation. In making climate and season the condition of a work's existence, Signal Festival is a textbook case of KŌ. Just as Vivid Sydney, which turns the southern winter into a venue, recomposed the slack season of the market into an apparatus for drawing an audience, here too the darkness of autumn is itself the premise of the programming.

Turning the City into a Gallery

Signal Festival is not an event of scale alone. Since 2023 Pavel Mrkus has served as general curator, and the programme has been assembled under a three-year framework titled "Ecosystems." Refik Anadol, Rafael Lozano-Hemmer, Krištof Kintera and others — international artists and Czech artists alike — have contributed work over the years. A programming that cuts across light design, generative practice, AI and conceptual work brings the festival of the streets close to a showcase of the contemporary art of its own moment.

The festival positions itself as an event that has, over many years, "turned Prague into a living gallery of contemporary art." Linking historic urban space with the newest technology and treating the social themes of the present — that editorial line is supported by a stance that temporarily occupies architectural surfaces while treating the whole city as a single circuit-style exhibition room. Visitors do not step inside a venue; walking the city is itself the line of movement through the exhibition.

Light Made Permanent

Then, on 30 September 2025, the operators of Signal Festival opened Signal Space, a permanent gallery of digital art in the Old Town of Prague 1. The venue is the Old Town Market Hall, designed by the architect Jindřich Fialka and completed in 1896. Into this historic market space of iron and glass, roughly 2,500 square metres of it, were brought large-scale projections, installations of light and immersive sound environments. The operators call it the largest digital art gallery in the Czech Republic.

Echoes of Tomorrow, the exhibition that inaugurated the gallery, lined up works by Quayola, Max Cooper, Zachary Lieberman, Playmodes Studio and Shohei Fujimoto. Light that had been scattered across the streets over four nights was gathered inside a single building, and became something one can meet at any time on payment of admission.

Here the premise of KŌ begins to waver. Until now, the works of Signal Festival came into being only because the four nights of October were there as a temporal ground. When the autumn dark goes, the light goes with it. That was the stance of an event whose condition of existence was the season. The permanent Signal Space sets out to remove that condition, at least for once. Depending on neither climate nor season, not even on the length of the night, it keeps the same light burning the year round. The indoor immersive space connects to the lineage of permanent immersive facilities run on admission fees, of which Atelier des Lumières is the representative case. When the festival transposed light it had opened onto the city for a few autumn nights only into a box that can be entered at any time, it stepped into a different principle of programming.

Ma, and the Light That Is Kindled

Ma (間) is a concept of opening up space and time. The four nights of Signal Festival open, once a year, a great ma across a historic city. Walls and squares that were closed into daytime utility are vacated for a few autumn nights only, and there each work is kindled as a tenkei. Those who walk trace the streets as though moving across a scroll, meeting one point of light after another as they rise out of the dark. Each individual work emerges as figure only because the darkness of October is there as ground. When the festival ends the wall returns to being a wall, and a year later, in the same places, the light is kindled anew in the autumn. To vacate and to kindle, to kindle and to vacate — this breathing was itself the event of KŌ.

Making it permanent is not an attempt to stop that breathing. It is rather an attempt to rescue the tenkei from the street and re-seat it, as a point that does not go out across the year, inside a historic market space. The four-night festival remains light kindled in the dark of a season. The permanent gallery becomes an apparatus that holds that light apart from the season. To the question of what to kindle in the city, Signal Festival has set two answers side by side — light that opens onto the city for a few autumn nights only, and light that keeps burning inside a box one can enter at any time. A single historic city, Prague, is the vessel for both.

Sources

1. fig.001SIGNAL FESTIVAL 2024 | AFTERMOVIE (Official YouTube)
2. fig.002Signal Festival 2023 Aftermovie (Official YouTube)
3. [3]Signal Festival — About (founders, history, curation)
4. [4]Signal Festival — Official Site (2026 dates)
5. [5]Signal Space — The Largest Digital Art Gallery in Czechia (Official)
6. [6]Signal Space — new gallery for digital art to open in Prague (official news)
7. [7]Signal Festival — Wikipedia (history, attendance, 2020 cancellation)
8. [8]expats.cz — First look: Signal Fest's permanent space has opened (Signal Space opening)

Operations Record

OPERATOR

Signal Production s.r.o., produced by the Signal Creative studio

LOCATION

Prague

MODEL

Festival programming — A privately run festival founded in 2013; in 2025 it opened the permanent Signal Space gallery, extending its lineage from a seasonal event into year-round operation

CADENCE

Four nights each October (15–18 October in 2026); the permanent Signal Space is open year-round

SPEC

Projections and installations across Prague's streets, squares and historic landmarks; the permanent Signal Space occupies the Old Town Market Hall (an iron-and-glass building completed in 1896, ~2,500 m²)

SINCE

2013

STATUS

Active — The 2020 edition was cancelled due to COVID-19 — the only year not held since 2013

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