We studied an interactive (functional and intentional interactivity) and immersive (technical and psychological immersion) device with a personal 3D viewer (360° vision and environmentally ego-centered) and its effects on the explicit long-term memories of the subjects (4 groups of 30 students for a total of 120 subjects) (2007 and 2012).We have tested memory, communication and feeling of presence in our virtual environment with a canonic test of presence (Witmer and Singer, 1998). This article is a reflection on these 3D devices and their impact on the long term memory of the students, and on their presence sensation.