Rare Samuel Gabriel Sons & Co Marble Mosaic SetThough not designed by Froebel, this marble mosaic set feels very Froebel ian, designed to encourage design learning and creative play. I've found a few other antique "Mosaik" or "Mosaic" sets with clay marbles, including sets made by Richter (Meteor) and, later, Milton Bradley, but no other made by Samuel Gabriel Sons & Co., NYC, which Harvard cites as having been founded in 1907, selling paper novelties and publishing children's books, until being