A method for displaying images or videos on a display, the display being mobile and having a marked position in a first mark, the display being comprised in a virtual reality headset, the method comprising: - a step of receiving at least two images or videos, the images or videos coming from video surveillance cameras, - a step of real-time acquisition of the position of the display in the first mark, - a step of computing an arrangement of the least two images or videos received on at least one projection surface belonging to a virtual world defined in a second mark, the second mark being the image of the first mark by a combination of geometric transformations, the at least one projection surface being a model of a screen wall, a screen wall being formed of a set of screens arranged side by side, the at least one projection surface having at least one face comprising screens suitable for displaying images or videos, each screen being a display location on the projection surface, each screen comprising an idle configuration according to which no image or video is displayed on said screen and a display configuration according to which an image or video is displayed on said screen, the computing step comprising computing the position of each considered image or video on the at least one projection surface so that each position of an image or video is located at the location of a different screen for each image or video, the images or videos arranged on the projection surface being independent of each other, - a first step of displaying the received images or videos on the corresponding screens of the projection surface, and - a second step of displaying, on the display, at least a part of the projection surface seen from an observation point (P2') in an observation direction (Y2') in the second mark, the observation point (P2') and the observation direction (Y2') being determined in real time as a function of the position of the display in the first mark. - a step of receiving at least two images or videos, the images or videos coming from video surveillance cameras, - a step of real-time acquisition of the position of the display in the first mark, - a step of computing an arrangement of the least two images or videos received on at least one projection surface belonging to a virtual world defined in a second mark, the second mark being the image of the first mark by a combination of geometric transformations, the at least one projection surface being a model of a screen wall, a screen wall being formed of a set of screens arranged side by side, the at least one projection surface having at least one face comprising screens suitable for displaying images or videos, each screen being a display location on the projection surface, each screen comprising an idle configuration according to which no image or video is displayed on said screen and a display configuration according to which an image or video is displayed on said screen, the computing step comprising computing the position of each considered image or video on the at least one projection surface so that each position of an image or video is located at the location of a different screen for each image or video, the images or videos arranged on the projection surface being independent of each other, - a first step of displaying the received images or videos on the corresponding screens of the projection surface, and - a second step of displaying, on the display, at least a part of the projection surface seen from an observation point (P2') in an observation direction (Y2') in the second mark, the observation point (P2') and the observation direction (Y2') being determined in real time as a function of the position of the display in the first mark.