Hin und Wieder (Once in a While) traces the shadows cast by sunlight through the front windows of Sayner Hütte, a former metallurgical plant in Bendorf, Germany. Coal marks these movements across the space, while a multichannel solar-powered sound piece activates as sensors meet the light. The sound draws from fragments of the Lux Aeterna chant from the Graduale Romanum, responding to the building's Gothic-inspired architecture. Together, light, sound, and coal as a material map the rhythms of this place where nature and architecture shape one another.

Photos: Harald Wittig / Kyle Witzen / Björn Rodday / Juan Bermudez