WILLEM de RIDDER
Colour print of the original slide for the show with paper constellations (here in polyeathylene) at the RAI Congress Centre Amsterdam, 1964, 20,2x20,2 cm.; signed by Willem de Ridder in black marker on the image, at the lower right corner.
(This photograph was used in onf the frontover of the book publication "The Adventures of Willem de Ridder". (Amsterdam 2017)