A 13-sided shape known as “the hat” has mathematicians tipping their caps. It’s the first true example of an “einstein,” a single shape that forms a special tiling of a plane: Like bathroom floor tile ...

Home design trends come, go, and then return—outdated flooring styles are no exception to this. Flooring types like terracotta, colored tiles, and mosaic were once seen as passé, but they're now ...