"Champion, who goes by Rootkid online, created a piece he calls " Spectrum Slit" that turns radio signals within the 2.4 GHz and 5 GHz bands used by Wi‑Fi, Bluetooth, and other commonly-used technologies, into light displayed in a linear array of 64 LED filaments, each corresponding to a specific segment of the spectrum."
""At moments of low network usage, the sculpture emits faint, intermittent light, reflecting the ambient background noise of an urban environment," Champion explained. "As wireless activity increases, the filaments surge and saturate, forming dense bands of intense illumination.""
""For all my projects, the motivation is the same," Champion told The Register. "We tend to look past the technology that surrounds us and shapes our lives. My work is about forcing us to look at it, and seeing the beauty in engineering.""
Théo Champion (Rootkid) built Spectrum Slit to convert nearby radio activity in the 2.4 GHz and 5 GHz bands into visible light across a linear array of 64 LED filaments, with each filament mapped to a specific spectral segment. The installation emits faint, intermittent light during low network usage and produces dense, saturated bands as wireless activity increases. The system uses a HackRF One software-defined radio with a Raspberry Pi running Python to sample signals and drive the LEDs. A video of the build shows strong illumination in an urban apartment when neighbors return home.
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