Build color legend

https://clhenrick.github.io/color-legend-element/

Angle Between Points

https://bl.ocks.org/HarryStevens/b212d3166a85aecb9d5fc61cf660de23

Animated Bezier curves

https://www.jasondavies.com/animated-bezier/

Angle of Reflection

https://bl.ocks.org/HarryStevens/b03d6496bdaf2a21cc4b1a4c854b5cfe