Tattoos are one of the oldest art forms in the world, with evidence of traditional tattoos found on Egyptian mummies dating back to the fifth century B.C. Tattooing has come a long way since then and today, it has become an increasingly popular form of self-expression. One of the most unique and eye-catching forms of modern tattooing is the traditional knife tattoo. This type of body art is growing in popularity, and it's easy to see why.