My thought was: "Wow, he must've gotten a great deal on those, or else ordered far too many and was stuck finding places for them..."

The house was designed by Frank Lloyd Wright's son. Maybe he was influenced by the concrete blocks from the Millard House. https://www.architecturelab.net/millard-house-frank-lloyd-wr...

I don't but wanted to say that I love the continuity of them used in different spaces. The whole place really looks like a single vision put together and not a bunch of disparate rooms.

They remind me of the floor of the black lodge in Twin Peaks.

I'm guessing he liked it, visually.

And just maybe it symbolized something for him. Low maybe.

TFA says “The facade’s cement chevrons catch the sun” but I’m not sure about the ones inside.

Yeah the outdoor ones definitely look like cement. The indoor ones are probably too. Though they have a patina that makes them look like worn iron.

Lynch made those himself out of grey plaster. They didn't show much of Lynch's studio, but that's where he spent most of his time hanging out, making sculptures and paintings and building things. He was hands on guy who kept himself busy, compulsively so.

Maybe they would catch rainwater too - mosquito breading area