Ruhrtriennale

People walk over the installation 'test pattern' (100m version) by Japanese artist Ryoji Ikeda at the Ruhrtriennale music and arts festival in the Kraftzentrale in Duisburg, Germany, Friday, Aug. 23 2013.

Caroline Seidel/DPA/AP

People walk over the installation “test pattern” (100m version) by Japanese artist Ryoji Ikeda at the Ruhrtriennale music and arts festival in the Kraftzentrale in Duisburg, Germany, on Friday.