Kumo o Tsukamu Yoo "like grasping a cloud"

Since nobody can actually grasp a cloud, the expression denoteds impossibilily. From afar, a cloud has shape and form. Close-up, its gossamer essence dissipates at the touch. So when a not-so-talented sixteen-year-old declares that she's going to become a movie star, you can respond by saying it's a kumo o tsukamu yoona dream-a mild warning that the ambition or goal is highly unlikely to be realized.