Abstract: A portable device includes a viewing direction sensor configured to determine the viewing direction of a user of the portable device in the real world and a position determiner configured to determine a position of the user in the real world. Furthermore, the portable device includes a processing unit configured to generate—based on the viewing direction of the user and the position of the user in the real world—a virtual world in which a change of the viewing direction in a 3D coordinate system of the real world leads to a change of the viewing direction in a 3D coordinate system of the virtual world. The portable device further includes a display configured to display the generated virtual world to the user while blocking a view of the real world.

Abstract: A vehicle includes a side wall, a ceiling and a speaker arrangement including at least one speaker. The speaker arrangement is positioned in or at the side wall and is configured such that a main sound emission direction of the speaker arrangement is directed to the ceiling.