In 1954, he was awarded the Venice Biennale prize for printmaking, and in 1957 was commissioned to produce two vast ceramic wall decorations, Wall of the Sun and Wall of the Moon (installed 1958) for the UNESCO Building in Paris.
It boasts a mix of different architectural styles, with elaborate wood - carved ceilings and marvellous walldecoration with ceramic tiles from the 15th / 16th centuries.