How does a magnetic drawing board work?

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Tags

1. #magnet
2. #stylus
3. #shapes
4. #panel
5. #particles
6. #liquid
7. #white
8. #eraser
9. #surface
10. #hidden
11. #provided
12. #drawn
13. #display
14. #sliding
15. #magnetophoretic
16. #optionally
17. #element
18. #opaque
19. #these
20. #filled
21. #removed
22. #drawing
23. #tipped
24. #thick
25. #magnetic
26. #containing