How many refrigerator magnets can you use?
Try some flint knapping glass, fun and you can always glue it to a magnet!
I used copper tubing and plate window glass.
Once it gets going, easy peasy!
Wear glasses.
Even works with old Blatz beer bottle glass.
I think that would be messy in my living room. I give the needlepoint magnets away. They say "JESUS," "HOPE," "PEACE," and stuff like that ... whatever I can chart out in block letter in the available space.
You’re not really knapping if you have an electrical carving tool. Those 3,000 BC folks didn’t have electrical carving tools!