Curly—or Karelian—birch is a mysterious tree with a patterned wood texture and a bizarre trunk shape. Unlike the elegant white-stemmed traditional birch, the Karelian one may seem unsightly at first glance: It is a low-growing, sinuous tree with bumps and bubbles. But the Karelian birch is famous for its wood. With its beautiful shade, patterns, and durability, the material has been used since the XVIII century in the manufacture of furniture, even for the royal chambers. For this reason, the Karelian birch was called the "royal tree" and "wooden marble."