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I'm confused, how does it get: "Lots of natural light" if it's underground?

The article clarifies this multiple times both in the primary article and the Q&A section.

There are large windows at the front and the back of the house, in the atrium and on the rear side exposed by the slope of the hill.

Still, there isn't a single picture from inside the house. A video showing how is it to live inside a hill etc..