It began with illuminating the "sails" of the city's beloved Opera House, a mind-blowing color and light show that continues through June 9. It's free to the 800,000 or so people who come to watch. (That's how many attended last year.)
Organizers say this year's light projections tell a story "from the birth of architecture and civilization through to the pinnacle of human and technological achievement." It was created by 59 Productions, the company that worked on the 2012 Olympic Summer Games opening ceremonies in London.
The light show is free and will continue from 6 p.m. to midnight daily until June 9.