Crevice
In this building there's a small sun that's small. They keep this small, small sun inside of a crevice.
You wouldn't want to keep a sun out in the open, even if it's small (and small). You'd put it inside something, like a crevice. Imagine walking into the building and seeing the small sun right inside, in a crevice.
げき
すき
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They keep the sun in the crevice because this is a place where people ski (すき).
If the sun were out in the open, it'd melt all the snow, making it hard to ski here. So they hide the sun away in a crevice so people can ski.