In the image caption above you see the solution to the equation given in the first line in the second line. A simple looking innocuous equation doesn't have a solution in the real line. In order to solve it, we have to jump into the imaginary line.
Although we are still some decades away, IMHO, from building full Artificial General Intelligence, we have succeeded in building some kind of artificial intelligence based on deeplearning techniques which are in some ways better than the older GOFAI systems of the 50s - 80s era.