Leather

I like leathercraft. You prepare the piece of skin and lightly sketch in the design. With specialized knives, you carve the skin into calligraphic lines and geometric shapes. You can then color it with dyes and further accessorize it with grommets and brads. You can join pieces of leather with strong thread or long laces of leather itself. Skin is surprisingly strong and flexible. It's naturally stiff after the host animal has died. Inuit women spend days chewing on reindeer and seal skins to soften them enough to be used for clothing, shoes,  and kayaks. It's something that we do by machine now: giant steel jaws equipped with salivary glands emitting tanning fluids massage the skins of recently living ungulates. Some of these machines are integrated in the slaughterhouses directly: Cattle in this end, hamburger, gelatin, horn products and leather out the other end.