Most noticeable because it deals with a crippled child without dwelling on her handicap (Margaret happens to have leg braces and a wheelchair), this creaky little instrument of benevolence has more than the Hoban look in common with Miriam Cohen's classroom stories--but less charm to relieve the ed psych. It's about Margaret, who is good at balancing things, and resentful Tommy, who knocks over her towers. For the school carnival Margaret makes an elaborate city of dominoes, which must be guarded from Tommy until the night of the drawing. The lucky winner who gets to knock over the dominoes turns out to be Tommy--so he is happy and so is Margaret, whose idea has made the most money in the carnival. The proper response to this is to stick a star on everyone's forehead and split for recess.