You are looking at the biggest firework ever fired, weighing a total 460kg — a new world record. According to NHK, it exploded over the city of Konosu — in the island of Honshu, Japan — into a breathtaking rosette about 800m in diameter.
The fireworks shell measured 120cm in diameter and was fired with a cannon. Go to the minute 3:11 for the money shot, although I recommend watching the entire thing at full screen in full HD. It has some really beautiful moments.