In the mid-1960s Marta Hoepffner made a series of "Farbinterferenzbilder", such as the one offered here, which she created using so-called "variochromatic light objects".
Lit.: Eva Scheid (ed.). Lichtbilder - Bilder des Lichts. Marta Hoepffner. Fotokünstlerin und Pädagogin. Hofheim am Taunus 1997.