OMGosh these wall are awesome! Commonly known as Sho sugi-ban (an ancient Chinese technique). The wood is carefully charred, doused in water, cooled, brushed to remove dust and loose debris, and then stained/sealed to create the unique designs. The process makes the wood fire, rot and pest resistant.
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SHOU SUGI BAN OUTDOOR TABLE DIY Shou sugi ban, or Yakisugi, is a traditional Japanese method of burning cedar (sugi) before finishing it with natural oil. Normally used as exterior siding, the charred wood is pest and rot resistant for up to eighty years.