i used the flat ones for roofs, as well. There were three sizes of Lincoln Logs in my set. Logs with one, two and three notches. and i had a little wodden chest which was built by my uncle to hold them in. The box had my first name on it. but not my middle name. That's John Thomas, which I recently learned is a synonym for penis in britain. if I grew up in london, i'd be very upset with my parents. John and the included toilet references (and later the customer of a prostitute references) were bad enough.