Projection device with a projector and a deflecting mirror

The invention relates to a projection system comprising a projector (10) and a deflection mirror (11), in which the projected image, after following a direction of projection along a principal axis of projection (5), strikes the deflection mirror (11) which is mounted such that it can be moved in two spatial directions.he mirror surface of said mirror deflects a projected light bundle (22) at an elevation angle and an azimuth angle onto a projection surface (9) positioned on the ground (4). The image is projected from the direction of a zenith (2) at an angle beta which is less than 60 DEG in relation to a vertical starting from said zenith (2). The deflection mirror (11) is positioned on the ground (4). The projected light bundle (22) can be deflected towards the projection surface (9) such that an image (6) can be created on said projection surface (9) and displaced on same.