[ziolko]

It would be so much fun to make replicas of his art on the "Etch A Sketch" [1].

[1] https://en.wikipedia.org/wiki/Etch_A_Sketch

[ndsipa_pomu]

I wonder how his art would have been affected if he'd had access to an Etch-A-Sketch?

[MrMcCall]

I wonder, did anyone ever make one of those with an "erase" button?

[Someone]

The particles are aluminium. That isn’t ferromagnetic, but its conductivity is good, so you can induce eddy currents in the particles.

That hints at a totally impractical way to do that with regular etch a sketch: put a strong magnet on top of the screen wherever you want the image to be retained and flip over the device.

Where you put magnets, eddy currents will be induced into the aluminium dust. Those will generate a magnetic field that slows down the particles, as they drop towards the screen.

So, if wait just long enough, and flip the device back, you can prevent those particles from reaching the screen.

Problems/challenges:

- “just long enough” will be very tricky to accomplish

- you probably will need very strong magnets

- it will be a challenge to have well-defined regions where your magnet(s) don’t affect the screen

⇒ I guess it may be easier (not easy) to cool your etch a sketch to -196 °C and use a strong magnet (https://youtu.be/zU3niMdjegQ?feature=shared)

Easiest probably would be https://hackaday.com/2024/03/27/sort-of-electromagnet-attrac... (likely still impractical for the distance needed in an etch a sketch)