With dazzling images bogged down by rules and explanations, The Imaginary becomes a frustrating experience. The Yoshiyuki Momose-directed, Studio Ponoc-produced animated adventure, now available on Netflix, is deeply moving at times, adapting the British children’s novel of the same name to tell a story from the perspective of an imaginary boy in danger of being forgotten. However, just as it approaches poignant moments, it swerves in too many muddled...