4.0 also ships new Cubehelix color schemes, including [Dave Green’s default](https://github.com/d3/d3-scale#interpolateCubehelixDefault) and a [cyclical rainbow](https://github.com/d3/d3-scale#interpolateRainbow) inspired by [Matteo Niccoli](https://mycarta.wordpress.com/2013/02/21/perceptual-rainbow-palette-the-method/):
4.0 also ships new Cubehelix schemes, including [Dave Green’s default](https://github.com/d3/d3-scale#interpolateCubehelixDefault) and a [cyclical rainbow](https://github.com/d3/d3-scale#interpolateRainbow) inspired by [Matteo Niccoli](https://mycarta.wordpress.com/2013/02/21/perceptual-rainbow-palette-the-method/):