For the joint issue of the SEPAC members 2020 with the theme "artwork in a national collection" POST Philately has decided to collaborate with the Mudam Luxembourg - Musée d'Art Moderne Grand-Duc Jean. The work "Many Spoken Words" by the Luxembourg artist Su-Mei Tse (born 1973), created in 2009, was selected as part of the museum's collection. In 2003 Su-Mei Tse was awarded the Golden Lion for the Luxembourg pavilion at the Venice Biennale.