Pet peeve and let's stick to the Specs ;-)
This improves the visual appearance of the pendulums.

In the original setting the varying length of the pendula was not really
easy to catch.
Now with 15 Pendula

The example video had 15 pendula, so I wanted to use that number as well.
Merge branch 'ImproveLength' of https://github.com/dietmarw/HarmonicMotion