Austin could be known as the capital city of nicknames. Residents of Austin are known as "Austinites" and in the '90s it also became known as "Silicone Hills". The current official slogan promotes Austin as the "Live Music Capital of the World" but many Austinites have adopted the unofficial slogan of "Keep Austin Weird". In the late 1800s it was known as the city of the "Violet Crown" " for the wintertime violet glow of colour across the hills just after sunset. It's also known as a "clean air city" for its strict no-smoking laws that apply to all public places, restaurants and buildings.