About the Author

Bob Knetzger has been making fun stuff all his life—first as a kid with his trusty Vac•U•Form and Thingmaker toys, then as a professional toy designer at Mattel, and for the last 35 years as an independent toy inventor. Bob’s designs for toys and games have appeared on television, in hundreds of millions of cereal boxes, in the pages of Make: magazine, and now in your very hands!