Pendulum - Magical and difficult double pendulum

This app has simple GUI and easy control.
supporting English, Korean and It is controlled by only 4 buttons.

This is like real.
Both real and this are same when there is no air and no friction.
But that isn't exist in real,
It is like real only pendulum makes chaos.

It made easy to know why double pendulum makes chaos.
End of pendulum makes pink line.
it is not exist and we don't know this app why exist.

Beautiful background
It is space that background of this app.
It means we don't understand chaos,
like the space.