A double rainbow captured by a lifeguard at Sydney's iconic Bondi Beach on Wednesday.
CNN  — 

It’s one of the world’s most beautiful cities, but Sydney’s sunset was twice as spectacular Wednesday when its beaches, harbor and city skyline were framed by a rare double rainbow.

Social media was awash with breathtaking pictures, with the sight literally stopping traffic on the city’s streets.

A rainbow is a natural phenomenon, formed when sunlight hits falling rain. The rain’s tiny drops refract the sun’s light into its individual color components and reflect it back at different angles, forming the seven colors of the rainbow. A double rainbow happens when these rays of light are refracted twice.

Science aside, there’s no arguing with these amazing pictures.