It is much stronger and lighter than frequent plaster-of-Paris ornaments, and is not so liable to chip or break if struck with nearly anything. Tetrahedral carton of milk Although fairly normally formed just like a cuboid, it is not unusual to locate cartons lacking proper angles and straight edges, as https://www.diigo.com/item/note/b80do/onqd?k=545439ef38c3924af572727675310365