There are lots of little details that people wouldn't necessarily pick up consciously, says Musk. Just improving visibility and having the glass like this is actually quite hard because it's so sloped. We are going to be using effectively a form of armored glass for the car. There are lots of little details that people wouldn't necessarily pick up consciously, says Musk. Just improving visibility and having the glass like this is actually quite hard because it's so sloped. We are going to be using effectively a form of armored glass for the car.