Did you have a screne saver which alike these back tattoo? 🙂 I did!
But to be serious, this tattoo, even though done on a flat human skin, is making an impression of three dimentional drawing in which all lines do not meet each other, there are no crossings. I believe, that they are also moving while this person walks and it becomes a pure black magic – blackwork magic. Tattoo magic for all of us to admire and want to have tattoos for ourselves.