Otto Piene’s (1928–2014) prodigious oeuvre includes his well-known smoke and fire paintings, “light ballet” installations and “Sky Art” events along with kinetic sculptures, ceramics, screen-prints and architectural interventions. Characterized by a combination of art and technology, his work demands that viewers play an active role in the artwork. A keen philosophical thinker, Piene also wrote a number of essays about art and perception.