Device Needed for Chaotic Systems Demonstration

[SphericalCow]

I'm trying to do a demonstration of chaotic systems for college students.

If anybody knows where I can find a desktop double pendulum online / how I can DIY one without woodworking that'd be much appreciated.

I did find the "swinging sticks kinetic sculpture", but I'd prefer a more classic example such as a double pendulum (or any other ideas you might have).

 

[Swamp Thing]

They might also enjoy making a system themselves. Make a pendulum with a magnetic bob, and hang it over the table top so it hangs about an inch above with the North facing down. Put some magnets on the surface at random positions with the north facing up.

https://www.jusleg.com/ChaoticMagneticSuperPendulum/

 

[DaveC426913]

A golf ball sitting atop a basketball is a very simple demonstration of a chaotic system.

So, we are led to believe, is Laura Dern's knuckle.

 

[haushofer]

How about a dripping faucet?

 

[berkeman]

You could casually have one of these sitting on the desk next to you during lecture, and see which student mentions the relevance first (give them a little extra credit).

https://eveshop1.top/products.aspx?cname=yellow+wax+lava+lamp&cid=202