I used to have a toy, sometime around when my baby teeth fell out, which used a magnetic stylus to arrange iron filings on a face underneath a plastic front plate. You could give it any combination of hair and beard you liked. I swear this is exactly how the result looked.
27th Street 
What a great toy. It teaches science plus you get to have fun with hair and beard.
I used to have a toy, sometime around when my baby teeth fell out, which used a magnetic stylus to arrange iron filings on a face underneath a plastic front plate. You could give it any combination of hair and beard you liked. I swear this is exactly how the result looked.