As a former boy, a father immediately understands why his son builds a tower of blocks, calls it a boom crane, and then knocks it down. But why does his daughter build the same tower, call it an ice-cream cone, and then offer a taste? As Harry Harrison, author of the chunky little bestseller Father to Son, with 322,000 copies in print, would suggest, fathers of daughters should simply enjoy that imaginative treat, and every other she's likely to dream up.