The artwork of pop singer Cat Stevens must be judged amateurish. But his childish, nearly empty landscapes and the stylized two dimensional forms of Teaser and Firecat have a certain dreamy simplicity and their shortcomings are deemphasized by an appropriate format which keeps the pictures modestly small and seemingly impromptu in placement. The story, in which Teaser and Firecat dislodge the moon after it becomes stuck on a barn roof, then follow it down the purple river and are carried off when it drifts into the sky only to land once more in a ""prickle-red-tree"" -- is unexceptionably whimsical. A weightless pleasantry -- but the Spanish and French subtitles might anchor this in some collections.