The first pioneers of deep learning start tinkering with neural networks. They're all like, "Hey, we can make a computer learn stuff!"
The pioneers of deep learning get a little too old to be cool and start wearing neon-colored jumpsuits, but still rocking those neural networks.
Deep learning pioneers get a facelift (literally) and start using fancy new terms like "deep learning" instead of just "neural networks." They're all like, "We're not just talking about the '50s anymore!"