After an overview of the use of digital shadows in computing science research projects with cultural and social impacts and a focus on recent researches and insights on virtual theaters, this paper introduces a research mixing the manipulation of shadow avatars and the building of a virtual theater setup inspired by traditional shadow theater (or ``castelet'' in french) in a mixed reality environment. It describes the virtual 3D setup, the nature of the shadow avatars and the issues of directing believable interactions between virtual avatars and physical performers on stage. Two modalities of shadow avatars direction are exposed. Some results of the research are illustrated in two use cases: the development of theatrical creativity in mixed reality through pedagogical workshops; and an artistic achievement in ''The Shadow'' performance, after H. C. Andersen.

翻译：在概述了数字阴影在具有文化及社会影响的计算机科学研究项目中的应用，并聚焦于虚拟剧场领域的最新研究与洞见之后，本文介绍了一项将阴影化身操控与受传统皮影戏（法语中称为“castelet”）启发的虚拟剧场搭建相结合的研究。该研究在混合现实环境中展开。本文描述了虚拟3D场景设置、阴影化身的本质，以及在舞台上导演虚拟化身与真人表演者之间可信互动的相关问题。文中阐述了两种阴影化身的导演模式。研究成果通过两个用例得以展示：一是通过教学工坊在混合现实中发展戏剧创造力；二是基于汉斯·克里斯蒂安·安徒生作品改编的戏剧《阴影》在艺术表演中的实现。