This may seem like some random blotches of ink to the naked eye. But when you take a photo and turn it into its negative, the paper magically turns into an hyperrealistic painting of the Wolverine, all thanks to the mutant art powers of Brian Lai.
You can see him action here:
Here's another example of negative painting from another author -- this one in full colour -- posted by a reddittor in the post that highlighted Lai's art:
It's kind of a novelty thing, but awesome nonetheless.