I might paint my fence panels tomorrow :)

**Boy** · 27 May 2020, 10:32 AM

Art is many things! Thanks for posting, Egg.

**Acorn** · 27 May 2020, 10:52 AM

I was doing this forty years ago with light pens and double pendulums in the dark with an open shutter.

https://www.demonstrations.wolfram.com/DoublePendulum/

Less mess, more chaos.

Acorn

**handrawn** · 27 May 2020, 04:50 PM

the pendulum swings around and around...

**pauland** · 27 May 2020, 05:39 PM

Originally Posted by Acorn

I was doing this forty years ago with light pens and double pendulums in the dark with an open shutter.

https://www.demonstrations.wolfram.com/DoublePendulum/

Less mess, more chaos.

Acorn

Chrome pushed up a warning about your link - probably because of the HTTPS and there not being a secure certificate.

**Acorn** · 27 May 2020, 06:33 PM

Originally Posted by pauland

Chrome pushed up a warning about your link - probably because of the HTTPS and there not being a secure certificate.

That is annoying as I hit is earlier without issue. Just use https://www.demonstrations.wolfram.com and the Search "Double Pendulum". That seems fine.

Acorn

**Egg Bramhill** · 27 May 2020, 08:27 PM

It loaded fine for me around 2pm but both of your links are now giving a McAfee warning 'Warning: Potential Security Risk Ahead'.

**pauland** · 27 May 2020, 08:47 PM

Originally Posted by Acorn

That is annoying as I hit is earlier without issue. Just use https://www.demonstrations.wolfram.com and the Search "Double Pendulum". That seems fine.

Acorn

Click image for larger version.

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**Acorn** · 27 May 2020, 09:02 PM

I would not be much impressed if Wolfram has not renewed its security certificate but these things do happen.

This link should be all right: https://www.math24.net/double-pendulum/.

Acorn