Another in the ""have gravity-shoes--will travel"" quota, this is the standard juvenile answer to the contemporary question, ""Where Did You Go?"" To the moon -- of course. Chris Norton's private fantasy world was bordered by his garage where he found the makings of a space ship and attendant friendship with a complementary character, Bruce. Their imaginary flight proves such a success that before the afternoon ends adults decide to take the trip with them. The story is well-told, but basically there's very little action. Boys may find this familiar kind of play-experience worth reading about -- but we think they won't be held by it.