Highlights from the collection: Jens Ferdinand Willumsen

Upstairs in Ernest Thiel's house is the guest room where the writer Hjalmar Söderberg used to stay, and his desk is still in it. For this display the room holds Thiel's letters with the Danish painter J.F. Willumsen, whose 1907 Stockholm solo show Thiel backed and from whom he bought seven works.

You get every Willumsen the museum owns here except the big Sun over Southern Mountains, which hangs in the Munch Room: sunbeams fall through brown cloud onto a village at the water's edge. Photos of the museum's 1969 Willumsen show, its largest until then, sit with the letters. When the winter sun sets before four, that canvas is the most daylight your afternoon gets.

The museum says Willumsen is more or less forgotten in Sweden, and this is a small display, so pair it with the Lars von Trier show made with the Willumsen Museum. Both are in the 160 SEK ticket, free under 19. There's no lift, and Thursdays run to 20:00 until October ends.