A rather unusual project this one, by Jørn Utzon, the architect of the Sydney Opera House, for an art gallery for Danish 'painter' Asger Jorn (the inventor of 'three-sided soccer').
I say "unusual" because of the gallery's three stories, two of them are below ground. You can find out why and more about the project here and here. The picture at top shows the one above-ground storey, with just the tops of the three-level top-lit galleries peeking through, as Utzon said, like “crocuses big and beautiful in porcelain.”
The second photo above is a plaster model showing part of the internal spiral ramp system (very Guggenheim), just above a section through the buried building, and below a floor plan of the gallery level.
LINKS: Silkeborg Museum of Fine Arts - About: Architecture
Unbuilt project, Jørn Utzon, Silkeborg Art Museum extension - arcspace.Com