All 60 paintings by Nozkowski (born 1944) on display are the same size (small), untitled (but coded with a number), abstract, and have been created since 1980. And yet, the American painter says every one of them is based on a definite moment he’s experienced. Indeed, a closer look at the paintings reveals ‘‘pentimenti, abrasions and scarifications’’ that matched the flux of the artist’s emotions. It’s up to the viewer to provide his own interpretation. Left, ‘‘Untitled (8-55), 2003’’ (Private collection).

For its 25th anniversary, the foundation is unveiling treasures held by Swiss citizens, whose collections of European and American painting and sculpture were fortunate to have survived World War II. While many major artists are only represented by a single painting here, it is not surprising that Swiss artists — like Hodler, Vallotton and Giacometti — should have several works in the display. In the end, the show covers most of the aesthetic concepts that make up the fabric of early 20th-century art history. Left, René Magritte's "La ruse symétrique, 1928" (Private collection).