Mr. O. (teacher) has a large packing carton in the middle of the classroom. Two children notice the carton and ask, “What’s that for?” Mr. O. tells the two children that he noticed the school puppets do not have a puppet theater. “How could we make one from this box?” he asks the children. “You need a window,” one child says. “Yes, that’s true. I’ll draw one. Stand here, please. I’ll need the window the right height.” The conversation and the project have drawn a larger group of children.