A toy unlike any other (I think). You shake the ferrous metal shavings around the inside and watch as they slowly gather back around the magnetic areas. Then you repeat again when all the shavings have settled.
I made this toy before I made the lock, but forgot to post it up.
1. Empty, clean spice container (tall clear plastic one)
2. Small magnets (not too strong, round ones would work the best)
3. Corn Syrup
4. Plastic Vial with a rubber cap.
6. About a tablespoon of ferrous metal shavings ( https://www.instructables.com/id/EGPTPN17FFES1764M3/
Warning: Do this in a well vented area. Glue has toxic fumes (That's what I've been told).
Video below: I used magnets that were too strong, so only a small amount broke away from the fields.