In an interview with Hans Scheugl about the ideas and techniques behind some of his films, the film-maker Kurt Kren told the following anecdote, which sheds an interesting light on his work. For his film Tree again (1978), Kren used a highly sensitive infra-red color film, a type which usually has to be developed within a very short period of time. However, Kren who has always ...$不同色调下的树欲静而风不止。$一般般