So when the sun is behind you and the rain in front of you, you see a rainbow of colours reflected back from inside the raindrops. As well as the lovely colours, rainbows also have a unique shape.

A rainbow is always 84 degrees across ... Much architecture is based on these repeated shapes or lattices – the British Museum roof, for example. Today, 3D modelling and printing use triangle ...

The rainbow is a division of white light into many beautiful colors. These take the shape of a long round arch, with its path high above, and its two ends apparently beyond the horizon. There is, ...