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e-ink roofs :) press a button to turn the walls from black to white :)

• dylan604 4y ago
  "Down the road, Ruan said, he’s also interested in creating reflective paint in different colors, as well as paints that could switch from reflective to absorptive, depending on the season—like a building-size version of drinkware that changes color when you pour hot or cold water into it." From the TFA