These cool looking sculptures are actually interactive sound-making electronic circuits

Artist Eirik Brandal makes sculptural electronic circuits that generate music. Above, "composition #11"

Interactive sound sculpture, 2016

+12V, self-supplied

Two proximity sensors trigger and control the frequency of sine waves. The design is inspired by Dutch artist Piet Mondrian, hence the title, Composition #11. Exhibited in De Fabriek, Eindhoven, 2016.

He makes neat synths, too!