Amusingly I made a prototype of something similar 4 years ago during university:
https://www.facebook.com/1764751847/videos/10202928199083698...
It was done to promote the use of Ferrofluid for DataVis rather than a consumer product.
It was done to promote the use of Ferrofluid for DataVis rather than a consumer product.
https://drive.google.com/file/d/1iqUnmD79tMlswlQQhhId1cuW6DX...