In Brno, an interactive underpass has been created, where lights and colors are in motion

Brno - The tunnel under Heršpická street in Brno offers a visual experience for pedestrians and cyclists. The underpass is illuminated in such a way that throughout the day and the seasons, it changes color and reacts to the speed of a person's movement. According to the creators, it is a unique installation that likely has no equivalent in the Czech Republic. It will probably be exceptional in Europe as well, reported Lidové noviny.
    The lighting was designed by Filip Müller from Prague. He was reportedly aware that most underpasses in the Czech Republic do not escape graffiti. Therefore, graffiti became the foundation of the work, not in the form of vandalized writings, but as street art. According to him, graffiti also works well with light.
    "Properly created graffiti combined with dynamic colored light have the property of transforming static images into dynamic scenes," Müller described in the professional journal Light Engineering Devices. According to him, this is due to the fact that when, for example, a red object is illuminated with green or blue light, it appears black. When illuminated with red light, it instead comes to the foreground. An analogous effect works for green and blue as well.
    The dynamics of the changes in the light scene within the tunnel are controlled by the walker or cyclist themselves. At both ends of the tunnel are sensors that measure how quickly they are moving. The light wave then moves at three times their speed. Surprises, according to Müller, await those who stop in the underpass at night and let the light scenery play out into the darkness. "Some graffiti are created with spray paint containing phosphorus, which glows in the dark," he added.
    The installation was brought by the company CTP Invest, which operates an office complex nearby. "In simple terms, we wanted our clients to have something interesting to look at on their way to us. And we also wanted to take a little water out of the mill for graffiti artists who would surely spray their doodles on the wall," said Karel Smejkal, project manager of the company, to Lidové noviny. The decoration cost just under two million crowns.